Search criteria
214 vulnerabilities by golang
CVE-2026-27136 (GCVE-0-2026-27136)
Vulnerability from cvelistv5 – Published: 2026-05-22 15:01 – Updated: 2026-05-22 16:59
VLAI
Title
Invoking duplicate attributes can cause XSS in golang.org/x/net/html
Summary
Parsing arbitrary HTML which is then rendered using Render can result in an unexpected HTML tree. This can be leveraged to execute XSS attacks in applications that attempt to sanitize input HTML before rendering.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| golang.org/x/net | golang.org/x/net/html |
Affected:
0 , < 0.55.0
(semver)
|
Credits
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CVE-2026-25681 (GCVE-0-2026-25681)
Vulnerability from cvelistv5 – Published: 2026-05-22 15:01 – Updated: 2026-05-22 17:46
VLAI
Title
Invoking incorrect handling of character references in DOCTYPE nodes in golang.org/x/net/html
Summary
Parsing arbitrary HTML which is then rendered using Render can result in an unexpected HTML tree. This can be leveraged to execute XSS attacks in applications that attempt to sanitize input HTML before rendering.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| golang.org/x/net | golang.org/x/net/html |
Affected:
0 , < 0.55.0
(semver)
|
Credits
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CVE-2026-25680 (GCVE-0-2026-25680)
Vulnerability from cvelistv5 – Published: 2026-05-22 15:01 – Updated: 2026-05-22 17:00
VLAI
Title
Invoking denial of service when parsing arbitrary HTML in golang.org/x/net/html
Summary
Parsing arbitrary HTML can consume excessive CPU time, possibly leading to denial of service.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| golang.org/x/net | golang.org/x/net/html |
Affected:
0 , < 0.55.0
(semver)
|
Credits
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CVE-2026-42502 (GCVE-0-2026-42502)
Vulnerability from cvelistv5 – Published: 2026-05-22 15:01 – Updated: 2026-05-22 17:17
VLAI
Title
Invoking incorrect handling of HTML elements in foreign content in golang.org/x/net/html
Summary
Parsing arbitrary HTML which is then rendered using Render can result in an unexpected HTML tree. This can be leveraged to execute XSS attacks in applications that attempt to sanitize input HTML before rendering.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| golang.org/x/net | golang.org/x/net/html |
Affected:
0 , < 0.55.0
(semver)
|
Credits
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CVE-2026-39821 (GCVE-0-2026-39821)
Vulnerability from cvelistv5 – Published: 2026-05-22 15:01 – Updated: 2026-05-27 13:13
VLAI
Title
Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna
Summary
The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode("xn--example-.com") incorrectly returns the name "example.com" rather than an error. This behavior can lead to privilege escalation in programs using the idna package. For example, a program which performs privilege checks on the ASCII hostname may reject "example.com" but permit "xn--example-.com". If that program subsequently converts the ASCII hostname to Unicode, it will inadvertently permits access to the Unicode name "example.com".
Severity
9.6 (Critical)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| golang.org/x/net | golang.org/x/net/idna |
Affected:
0 , < 0.55.0
(semver)
|
Credits
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{
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},
{
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}
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CVE-2026-42506 (GCVE-0-2026-42506)
Vulnerability from cvelistv5 – Published: 2026-05-22 15:01 – Updated: 2026-05-22 17:45
VLAI
Title
Invoking incorrect handling of namespaced elements in foreign content in golang.org/x/net/html
Summary
Parsing arbitrary HTML which is then rendered using Render can result in an unexpected HTML tree. This can be leveraged to execute XSS attacks in applications that attempt to sanitize input HTML before rendering.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| golang.org/x/net | golang.org/x/net/html |
Affected:
0 , < 0.55.0
(semver)
|
Credits
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CVE-2026-46598 (GCVE-0-2026-46598)
Vulnerability from cvelistv5 – Published: 2026-05-22 02:31 – Updated: 2026-05-22 18:14
VLAI
Title
Invoking pathological inputs can lead to client panic in golang.org/x/crypto/ssh/agent
Summary
For certain crafted inputs, a 'ed25519.PrivateKey' was created by casting malformed wire bytes, leading to a panic when used.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-129 - Improper Validation of Array Index
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| golang.org/x/crypto | golang.org/x/crypto/ssh/agent |
Affected:
0 , < 0.52.0
(semver)
|
Credits
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CVE-2026-46595 (GCVE-0-2026-46595)
Vulnerability from cvelistv5 – Published: 2026-05-22 02:31 – Updated: 2026-05-22 18:21
VLAI
Title
Invoking VerifiedPublicKeyCallback permissions skip enforcement in golang.org/x/crypto/ssh
Summary
Previously, CVE-2024-45337 fixed an authorization bypass for misused ssh server configurations; if any other type of callback is passed other than public key, then the source-address validation would be skipped.
Severity
10 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| golang.org/x/crypto | golang.org/x/crypto/ssh |
Affected:
0 , < 0.52.0
(semver)
|
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CVE-2026-42508 (GCVE-0-2026-42508)
Vulnerability from cvelistv5 – Published: 2026-05-22 02:31 – Updated: 2026-05-22 18:44
VLAI
Title
Invoking auth bypass via unenforced @revoked status in golang.org/x/crypto/ssh/knownhosts
Summary
Previously, a revoked 'SignatureKey' belonging to a CA was not correctly checked for revocation. Now, both the 'key' and 'key.SignatureKey' are checked for @revoked.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| golang.org/x/crypto | golang.org/x/crypto/ssh/knownhosts |
Affected:
0 , < 0.52.0
(semver)
|
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CVE-2026-39834 (GCVE-0-2026-39834)
Vulnerability from cvelistv5 – Published: 2026-05-22 02:31 – Updated: 2026-05-22 18:50
VLAI
Title
Invoking infinite loop on large channel writes in golang.org/x/crypto/ssh
Summary
When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress. The size comparison now uses int64 to prevent truncation.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-190 - Integer Overflow or Wraparound
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| golang.org/x/crypto | golang.org/x/crypto/ssh |
Affected:
0 , < 0.52.0
(semver)
|
Credits
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CVE-2026-39827 (GCVE-0-2026-39827)
Vulnerability from cvelistv5 – Published: 2026-05-22 02:31 – Updated: 2026-05-22 18:35
VLAI
Title
Invoking memory leak when rejecting channels can lead to DoS in golang.org/x/crypto/ssh
Summary
An authenticated SSH client that repeatedly opened channels which were rejected by the server caused unbounded memory growth, eventually crashing the server process and affecting all connected users. Rejected channels are now properly removed from the connection's internal state and released for garbage collection.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| golang.org/x/crypto | golang.org/x/crypto/ssh |
Affected:
0 , < 0.52.0
(semver)
|
Credits
{
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CVE-2026-39835 (GCVE-0-2026-39835)
Vulnerability from cvelistv5 – Published: 2026-05-22 02:31 – Updated: 2026-05-22 17:45
VLAI
Title
Invoking server panic during CheckHostKey/Authenticate in golang.org/x/crypto/ssh
Summary
SSH servers which use CertChecker as a public key callback without setting IsUserAuthority or IsHostAuthority could be caused to panic by a client presenting a certificate. CertChecker now returns an error instead of panicking when these callbacks are nil.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| golang.org/x/crypto | golang.org/x/crypto/ssh |
Affected:
0 , < 0.52.0
(semver)
|
Credits
{
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{
"name": "CertChecker.CheckHostKey"
},
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"name": "CertChecker.Authenticate"
}
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CVE-2026-46597 (GCVE-0-2026-46597)
Vulnerability from cvelistv5 – Published: 2026-05-22 02:31 – Updated: 2026-05-22 14:08
VLAI
Title
Invoking byte arithmetic causes underflow and panic in golang.org/x/crypto/ssh
Summary
An incorrectly placed cast from bytes to int allowed for server-side panic in the AES-GCM packet decoder for well-crafted inputs.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-191 - Integer Underflow (Wrap or Wraparound)
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| golang.org/x/crypto | golang.org/x/crypto/ssh |
Affected:
0 , < 0.52.0
(semver)
|
Credits
{
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"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
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"programRoutines": [
{
"name": "gcmCipher.readCipherPacket"
},
{
"name": "Dial"
},
{
"name": "NewClientConn"
},
{
"name": "NewServerConn"
},
{
"name": "curve25519sha256.Client"
},
{
"name": "curve25519sha256.Server"
},
{
"name": "dhGEXSHA.Client"
},
{
"name": "dhGEXSHA.Server"
},
{
"name": "dhGroup.Client"
},
{
"name": "dhGroup.Server"
},
{
"name": "ecdh.Client"
},
{
"name": "ecdh.Server"
},
{
"name": "mlkem768WithCurve25519sha256.Client"
},
{
"name": "mlkem768WithCurve25519sha256.Server"
}
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},
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"url": "https://go.dev/cl/781620"
},
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CVE-2026-39832 (GCVE-0-2026-39832)
Vulnerability from cvelistv5 – Published: 2026-05-22 02:31 – Updated: 2026-05-22 19:03
VLAI
Title
Invoking agent constraints dropped when forwarding keys in golang.org/x/crypto/ssh/agent
Summary
When adding a key to a remote agent constraint extensions such as restrict-destination-v00@openssh.com were not serialized in the request. Destination restrictions were silently stripped when forwarding keys, allowing unrestricted use of the key on the remote host. The client now serializes all constraint extensions. Additionally, the in-memory keyring returned by NewKeyring() now rejects keys with unsupported constraint extensions instead of silently ignoring them.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-281 - Improper Preservation of Permissions
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| golang.org/x/crypto | golang.org/x/crypto/ssh/agent |
Affected:
0 , < 0.52.0
(semver)
|
Credits
{
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{
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
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"timestamp": "2026-05-22T18:59:53.174504Z",
"version": "2.0.3"
},
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
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"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "golang.org/x/crypto/ssh/agent",
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"programRoutines": [
{
"name": "client.Add"
},
{
"name": "keyring.Add"
}
],
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}
],
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{
"description": "CWE-281: Improper Preservation of Permissions",
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"url": "https://go.dev/issue/79435"
},
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"url": "https://go.dev/cl/778642"
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"url": "https://groups.google.com/g/golang-announce/c/a082jnz-LvI"
},
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"url": "https://pkg.go.dev/vuln/GO-2026-5006"
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CVE-2026-39833 (GCVE-0-2026-39833)
Vulnerability from cvelistv5 – Published: 2026-05-22 02:31 – Updated: 2026-05-22 18:58
VLAI
Title
Invoking key constraints not enforced in golang.org/x/crypto/ssh/agent
Summary
The in-memory keyring returned by NewKeyring() silently accepted keys with the ConfirmBeforeUse constraint but never enforced it. The key would sign without any confirmation prompt, with no indication to the caller that the constraint was not in effect. NewKeyring() now returns an error when unsupported constraints are requested.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-358 - Improperly Implemented Security Check for Standard
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| golang.org/x/crypto | golang.org/x/crypto/ssh/agent |
Affected:
0 , < 0.52.0
(semver)
|
Credits
{
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"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 9.1,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
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}
],
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"timestamp": "2026-05-22T18:57:41.103317Z",
"version": "2.0.3"
},
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}
}
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
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{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "golang.org/x/crypto/ssh/agent",
"product": "golang.org/x/crypto/ssh/agent",
"programRoutines": [
{
"name": "keyring.Add"
}
],
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"versions": [
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"status": "affected",
"version": "0",
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"lang": "en",
"value": "NCC Group Cryptography Services, sponsored by Teleport"
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"lang": "en",
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}
],
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{
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{
"description": "CWE-358: Improperly Implemented Security Check for Standard",
"lang": "en"
}
]
}
],
"providerMetadata": {
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"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
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},
"references": [
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"url": "https://go.dev/issue/79436"
},
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"url": "https://go.dev/cl/778640"
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"url": "https://go.dev/cl/778641"
},
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"url": "https://groups.google.com/g/golang-announce/c/a082jnz-LvI"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-5005"
}
],
"title": "Invoking key constraints not enforced in golang.org/x/crypto/ssh/agent"
}
},
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}
CVE-2026-39820 (GCVE-0-2026-39820)
Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-05-08 14:27
VLAI
Title
Quadratic string concatentation in consumeComment in net/mail
Summary
Well-crafted inputs reaching ParseAddress, ParseAddressList, and ParseDate were able to trigger excessive CPU exhaustion and memory allocations.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Go standard library | net/mail |
Affected:
0 , < 1.25.10
(semver)
Affected: 1.26.0-0 , < 1.26.3 (semver) |
Credits
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CVE-2026-42501 (GCVE-0-2026-42501)
Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-05-08 15:48
VLAI
Title
Malicious module proxy can bypass checksum database in cmd/go
Summary
A malicious module proxy can exploit a flaw in the go command's validation of module checksums to bypass checksum database validation. This vulnerability affects any user using an untrusted module proxy (GOMODPROXY) or checksum database (GOSUMDB). A malicious module proxy can serve altered versions of the Go toolchain. When selecting a different version of the Go toolchain than the currently installed toolchain (due to the GOTOOLCHAIN environment variable, or a go.work or go.mod with a toolchain line), the go command will download and execute a toolchain provided by the module proxy. A malicious module proxy can bypass checksum database validation for this downloaded toolchain. Since this vulnerability affects the security of toolchain downloads, setting GOTOOLCHAIN to a fixed version is not sufficient. You must upgrade your base Go toolchain. The go tool always validates the hash of a toolchain before executing it, so fixed versions will refuse to execute any cached, altered versions of the toolchain. The go tool trusts go.sum files to contain accurate hashes of the current module's dependencies. A malicious proxy exploiting this vulnerability to serve an altered module will have caused an incorrect hash to be recorded in the go.sum. Users who have configured a non-trusted GOPROXY can determine if they have been affected by running "rm go.sum ; go mod tidy ; go mod verify", which will revalidate all dependencies of the current module. The specific flaw in more detail: The go command consults the checksum database to validate downloaded modules, when a module is not listed in the go.sum file. It verifies that the module hash reported by the checksum database matches the hash of the downloaded module. If, however, the checksum database returns a successful response that contains no entry for the module, the go command incorrectly permitted validation to succeed. A module proxy may mirror or proxy the checksum database, in which case the go command will not connect to the checksum database directly. Checksums reported by the checksum database are cryptographically signed, so a malicious proxy cannot alter the reported checksum for a module. However, a proxy which returns an empty checksum response, or a checksum response for an unrelated module, could cause the go command to proceed as if a downloaded module has been validated.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Go toolchain | cmd/go |
Affected:
0 , < 1.25.10
(semver)
Affected: 1.26.0-0 , < 1.26.3 (semver) |
Credits
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CVE-2026-39823 (GCVE-0-2026-39823)
Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-05-08 14:05
VLAI
Title
Bypass of meta content URL escaping causes XSS in html/template
Summary
CVE-2026-27142 fixed a vulnerability in which URLs were not correctly escaped inside of a <meta> tag's <content> attribute. If the URL content were to insert ASCII whitespaces around the '=' rune inside of the <content> attribute, the escaper would fail to similarly escape it, leading to XSS.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Go standard library | html/template |
Affected:
0 , < 1.25.10
(semver)
Affected: 1.26.0-0 , < 1.26.3 (semver) |
Credits
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CVE-2026-33811 (GCVE-0-2026-33811)
Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-05-08 14:25
VLAI
Title
Crash when handling long CNAME response in net
Summary
When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-415 - Double Free
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Go standard library | net |
Affected:
0 , < 1.25.10
(semver)
Affected: 1.26.0-0 , < 1.26.3 (semver) |
Credits
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CVE-2026-39826 (GCVE-0-2026-39826)
Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-05-08 14:05
VLAI
Title
Escaper bypass leads to XSS in html/template
Summary
If a trusted template author were to write a <script> tag containing an empty 'type' attribute or a 'type' attribute with an ASCII whitespace, the execution of the template would incorrectly escape any data passed into the <script> block.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Go standard library | html/template |
Affected:
0 , < 1.25.10
(semver)
Affected: 1.26.0-0 , < 1.26.3 (semver) |
Credits
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"name": "isJSType"
},
{
"name": "Template.Execute"
},
{
"name": "Template.ExecuteTemplate"
}
],
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}
],
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"lang": "en",
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}
],
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"description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
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}
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CVE-2026-39817 (GCVE-0-2026-39817)
Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-05-08 21:29
VLAI
Title
Invoking "go tool pack" does not sanitize output paths in cmd/go
Summary
The "go tool pack" subcommand (usually used only by the compiler as an internal tool with known-good inputs) does not sanitize output filenames. Extracting a malicious archive file with the "pack" subcommand can write files to arbitrary locations on the filesystem.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Go toolchain | cmd/go |
Affected:
0 , < 1.25.10
(semver)
Affected: 1.26.0-0 , < 1.26.3 (semver) |
Credits
{
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CVE-2026-39819 (GCVE-0-2026-39819)
Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-05-08 21:29
VLAI
Title
Invoking "go bug" follows symlinks in predictable temporary filenames in cmd/go
Summary
The "go bug" command writes to two files with predictable names in the system temporary directory (for example, "/tmp"). An attacker with access to the temporary directory can create a symlink in one of these names, causing "go bug" to overwrite the target of the symlink.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-377 - Insecure Temporary File
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Go toolchain | cmd/go |
Affected:
0 , < 1.25.10
(semver)
Affected: 1.26.0-0 , < 1.26.3 (semver) |
Credits
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CVE-2026-42499 (GCVE-0-2026-42499)
Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-05-08 21:29
VLAI
Title
Quadratic string concatenation in consumePhrase in net/mail
Summary
Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Go standard library | net/mail |
Affected:
0 , < 1.25.10
(semver)
Affected: 1.26.0-0 , < 1.26.3 (semver) |
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},
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"name": "AddressParser.Parse"
},
{
"name": "AddressParser.ParseList"
},
{
"name": "Header.AddressList"
},
{
"name": "ParseAddress"
},
{
"name": "ParseAddressList"
}
],
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"lessThan": "1.25.10",
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CVE-2026-39825 (GCVE-0-2026-39825)
Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-05-08 21:30
VLAI
Title
ReverseProxy forwards queries with more than urlmaxqueryparams parameters in net/http/httputil
Summary
ReverseProxy can forward queries containing parameters not visible to Rewrite functions. When used with a Rewrite function, or a Director function which parses query parameters, ReverseProxy sanitizes the forwarded request to remove query parameters which are not parsed by url.ParseQuery. ReverseProxy does not take ParseQuery's limit on the total number of query parameters (controlled by GODEBUG=urlmaxqueryparams=N) into account. This can permit ReverseProxy to forward a request containing a query parameter that is not visible to the Rewrite function. For example, the query "a1=x&a2=x&...&a10000=x&hidden=y" can forward the parameter "hidden=y" while hiding it from the proxy's Rewrite function.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Go standard library | net/http/httputil |
Affected:
0 , < 1.25.10
(semver)
Affected: 1.26.0-0 , < 1.26.3 (semver) |
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"url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"
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CVE-2026-39836 (GCVE-0-2026-39836)
Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-05-08 21:30
VLAI
Title
Panic in Dial and LookupPort when handling NUL byte on Windows in net
Summary
The Dial and LookupPort functions panic on Windows when provided with an input containing a NUL (0).
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-248 - Uncaught Exception
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Go standard library | net |
Affected:
0 , < 1.25.10
(semver)
Affected: 1.26.0-0 , < 1.26.3 (semver) |
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"packageName": "net",
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"programRoutines": [
{
"name": "Resolver.lookupPort"
},
{
"name": "Resolver.lookupAddr"
},
{
"name": "Resolver.lookupTXT"
},
{
"name": "Resolver.lookupNS"
},
{
"name": "Resolver.lookupMX"
},
{
"name": "Resolver.lookupSRV"
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{
"name": "Dial"
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{
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{
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{
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"lang": "en",
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"description": "CWE-248: Uncaught Exception",
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CVE-2026-33814 (GCVE-0-2026-33814)
Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-05-08 18:01
VLAI
Title
Infinite loop in HTTP/2 transport when given bad SETTINGS_MAX_FRAME_SIZE in net/http/internal/http2 in golang.org/x/net
Summary
When processing HTTP/2 SETTINGS frames, transport will enter an infinite loop of writing CONTINUATION frames if it receives a SETTINGS_MAX_FRAME_SIZE with a value of 0.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| golang.org/x/net | golang.org/x/net/http2 |
Affected:
0 , < 0.53.0
(semver)
|
|
| Go standard library | net/http |
Affected:
0 , < 1.25.10
(semver)
Affected: 1.26.0-0 , < 1.26.3 (semver) |
Credits
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CVE-2026-33812 (GCVE-0-2026-33812)
Vulnerability from cvelistv5 – Published: 2026-04-21 19:21 – Updated: 2026-04-21 20:43
VLAI
Title
Excessive memory allocation when decoding malicious SFNT in golang.org/x/image
Summary
Parsing a malicious font file can cause excessive memory allocation.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-789 - Memory Allocation with Excessive Size Value
Assigner
References
3 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| golang.org/x/image | golang.org/x/image/font/sfnt |
Affected:
0 , < 0.39.0
(semver)
|
Credits
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},
{
"name": "Font.GlyphIndex"
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{
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"name": "Font.LoadGlyph"
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"name": "Font.Name"
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{
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"name": "ParseReaderAt"
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CVE-2026-33813 (GCVE-0-2026-33813)
Vulnerability from cvelistv5 – Published: 2026-04-21 19:21 – Updated: 2026-04-22 15:34
VLAI
Title
Panic when decoding large WEBP image on 32-bit platforms in golang.org/x/image
Summary
Parsing a WEBP image with an invalid, large size panics on 32-bit platforms.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-190 - Integer Overflow or Wraparound
Assigner
References
3 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| golang.org/x/image | golang.org/x/image/webp |
Affected:
0 , < 0.39.0
(semver)
|
Credits
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CVE-2026-32281 (GCVE-0-2026-32281)
Vulnerability from cvelistv5 – Published: 2026-04-08 01:06 – Updated: 2026-04-13 18:19
VLAI
Title
Inefficient policy validation in crypto/x509
Summary
Validating certificate chains which use policies is unexpectedly inefficient when certificates in the chain contain a very large number of policy mappings, possibly causing denial of service. This only affects validation of otherwise trusted certificate chains, issued by a root CA in the VerifyOptions.Roots CertPool, or in the system certificate pool.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Go standard library | crypto/x509 |
Affected:
0 , < 1.25.9
(semver)
Affected: 1.26.0-0 , < 1.26.2 (semver) |
Credits
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},
{
"url": "https://pkg.go.dev/vuln/GO-2026-4946"
}
],
"title": "Inefficient policy validation in crypto/x509"
}
},
"cveMetadata": {
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"assignerShortName": "Go",
"cveId": "CVE-2026-32281",
"datePublished": "2026-04-08T01:06:58.354Z",
"dateReserved": "2026-03-11T16:38:46.556Z",
"dateUpdated": "2026-04-13T18:19:44.779Z",
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CVE-2026-32280 (GCVE-0-2026-32280)
Vulnerability from cvelistv5 – Published: 2026-04-08 01:06 – Updated: 2026-04-08 17:46
VLAI
Title
Unexpected work during chain building in crypto/x509
Summary
During chain building, the amount of work that is done is not correctly limited when a large number of intermediate certificates are passed in VerifyOptions.Intermediates, which can lead to a denial of service. This affects both direct users of crypto/x509 and users of crypto/tls.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Go standard library | crypto/x509 |
Affected:
0 , < 1.25.9
(semver)
Affected: 1.26.0-0 , < 1.26.2 (semver) |
Credits
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-32280",
"options": [
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"Exploitation": "none"
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}
],
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"timestamp": "2026-04-08T17:46:14.569488Z",
"version": "2.0.3"
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"cweId": "CWE-770",
"description": "CWE-770 Allocation of Resources Without Limits or Throttling",
"lang": "en",
"type": "CWE"
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"providerMetadata": {
"dateUpdated": "2026-04-08T17:46:47.347Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "crypto/x509",
"product": "crypto/x509",
"programRoutines": [
{
"name": "Certificate.buildChains"
},
{
"name": "Certificate.Verify"
}
],
"vendor": "Go standard library",
"versions": [
{
"lessThan": "1.25.9",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "1.26.2",
"status": "affected",
"version": "1.26.0-0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "Jakub Ciolek - https://ciolek.dev"
}
],
"descriptions": [
{
"lang": "en",
"value": "During chain building, the amount of work that is done is not correctly limited when a large number of intermediate certificates are passed in VerifyOptions.Intermediates, which can lead to a denial of service. This affects both direct users of crypto/x509 and users of crypto/tls."
}
],
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{
"descriptions": [
{
"description": "CWE-770: Allocation of Resources Without Limits or Throttling",
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"references": [
{
"url": "https://go.dev/cl/758320"
},
{
"url": "https://go.dev/issue/78282"
},
{
"url": "https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-4947"
}
],
"title": "Unexpected work during chain building in crypto/x509"
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},
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