RHSA-2026:13498
Vulnerability from csaf_redhat - Published: 2026-05-04 13:55 - Updated: 2026-05-04 21:24Summary
Red Hat Security Advisory: dovecot security update
Severity
Important
Notes
Topic: An update for dovecot is now available for Red Hat Enterprise Linux 10.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind. It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL drivers and authentication plug-ins are provided as subpackages.
Security Fix(es):
* dovecot: ManageSieve: Denial of Service via crafted SASL initial response in AUTHENTICATE command (CVE-2025-59032)
* dovecot: denial of service via crafted message before authentication (CVE-2026-27858)
* dovecot: denial of service via specially crafted NOOP command (CVE-2026-27857)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in ManageSieve. A remote attacker can exploit this vulnerability by sending a crafted SASL (Simple Authentication and Security Layer) initial response during the AUTHENTICATE command. This can cause the ManageSieve service to crash repeatedly, leading to a Denial of Service (DoS) for other users.
7.5 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2026:13498
A flaw was found in dovecot. An unauthenticated and remote attacker can send a specially crafted "NOOP" command containing numerous open and close parentheses without a command-ending line feed, causing the server to allocate an excessive amount of memory, resulting in a denial of service.
7.5 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2026:13498
Workaround
Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.
A flaw was found in dovecot. An unauthenticated and remote attacker can send a crafted message that causes managesieve to allocate an excessive amount of memory, forcing managesieve-login to be unavailable by repeatedly crashing the process, resulting in a denial of service.
7.5 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2026:13498
Workaround
To mitigate this vulnerability, protect access to the managesieve protocol by configuring firewall rules to restrict access to the managesieve port and only allow connections from trusted IP addresses or networks.
References
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"text": "A flaw was found in ManageSieve. A remote attacker can exploit this vulnerability by sending a crafted SASL (Simple Authentication and Security Layer) initial response during the AUTHENTICATE command. This can cause the ManageSieve service to crash repeatedly, leading to a Denial of Service (DoS) for other users.",
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{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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}
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{
"cvss_v3": {
"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"
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{
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"details": "Important"
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"title": "dovecot: ManageSieve: Denial of Service via crafted SASL initial response in AUTHENTICATE command"
},
{
"cve": "CVE-2026-27857",
"cwe": {
"id": "CWE-770",
"name": "Allocation of Resources Without Limits or Throttling"
},
"discovery_date": "2026-03-27T09:01:59.374065+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2452179"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in dovecot. An unauthenticated and remote attacker can send a specially crafted \"NOOP\" command containing numerous open and close parentheses without a command-ending line feed, causing the server to allocate an excessive amount of memory, resulting in a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "dovecot: denial of service via specially crafted NOOP command",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This flaw allows an unauthenticated and remote attacker to cause a denial of service via a specially crafted \"NOOP\" command. Due to this reason, this vulnerability has been rated with an important severity.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-27857"
},
{
"category": "external",
"summary": "RHBZ#2452179",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2452179"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-27857",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-27857"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-27857",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27857"
},
{
"category": "external",
"summary": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json",
"url": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json"
}
],
"release_date": "2026-03-27T08:10:20.761000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-05-04T13:55:49+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"url": "https://access.redhat.com/errata/RHSA-2026:13498"
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"scores": [
{
"cvss_v3": {
"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",
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"title": "dovecot: denial of service via specially crafted NOOP command"
},
{
"cve": "CVE-2026-27858",
"cwe": {
"id": "CWE-770",
"name": "Allocation of Resources Without Limits or Throttling"
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2452175"
}
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{
"category": "description",
"text": "A flaw was found in dovecot. An unauthenticated and remote attacker can send a crafted message that causes managesieve to allocate an excessive amount of memory, forcing managesieve-login to be unavailable by repeatedly crashing the process, resulting in a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "dovecot: denial of service via crafted message before authentication",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This flaw allows an unauthenticated and remote attacker to cause a denial of service via a specially crafted message. Due to this reason, this vulnerability has been rated with an important severity.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-27858"
},
{
"category": "external",
"summary": "RHBZ#2452175",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2452175"
},
{
"category": "external",
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{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-27858",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27858"
},
{
"category": "external",
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{
"category": "vendor_fix",
"date": "2026-05-04T13:55:49+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:13498"
},
{
"category": "workaround",
"details": "To mitigate this vulnerability, protect access to the managesieve protocol by configuring firewall rules to restrict access to the managesieve port and only allow connections from trusted IP addresses or networks.",
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"scores": [
{
"cvss_v3": {
"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",
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "dovecot: denial of service via crafted message before authentication"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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