Red Hat Security Advisory: dovecot security update
Multiple denial of service vulnerabilities have been identified in Dovecot, an IMAP and POP3 server for UNIX-like systems. These include issues triggered by crafted SASL initial responses in the AUTHENTICATE command, crafted messages before authentication, and specially crafted NOOP commands. Red Hat has released an important security update for Dovecot in Red Hat Enterprise Linux 10 to address these issues. The update mitigates the risk of denial of service attacks that could disrupt mail server availability.
AI Analysis
Technical Summary
This advisory covers three denial of service vulnerabilities in Dovecot: CVE-2025-59032 involves a crafted SASL initial response in the AUTHENTICATE command within the ManageSieve plugin; CVE-2026-27858 involves a denial of service triggered by a crafted message before authentication; and CVE-2026-27857 involves denial of service via a specially crafted NOOP command. These vulnerabilities could allow an attacker to disrupt service availability. Red Hat has issued patches for these vulnerabilities in Dovecot packages for Red Hat Enterprise Linux 10 and related variants.
Potential Impact
Successful exploitation of these vulnerabilities could cause denial of service conditions in the Dovecot server, potentially disrupting email services. There is no indication of code execution or data compromise. The impact is limited to service availability.
Mitigation Recommendations
Red Hat has released updated Dovecot packages for Red Hat Enterprise Linux 10 and its variants that address these vulnerabilities. Users should apply the security update as described in the Red Hat advisory RHSA-2026:13498 and the referenced article https://access.redhat.com/articles/11258. No additional mitigation is indicated or required beyond applying the official patches.
Red Hat Security Advisory: dovecot security update
Description
Multiple denial of service vulnerabilities have been identified in Dovecot, an IMAP and POP3 server for UNIX-like systems. These include issues triggered by crafted SASL initial responses in the AUTHENTICATE command, crafted messages before authentication, and specially crafted NOOP commands. Red Hat has released an important security update for Dovecot in Red Hat Enterprise Linux 10 to address these issues. The update mitigates the risk of denial of service attacks that could disrupt mail server availability.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This advisory covers three denial of service vulnerabilities in Dovecot: CVE-2025-59032 involves a crafted SASL initial response in the AUTHENTICATE command within the ManageSieve plugin; CVE-2026-27858 involves a denial of service triggered by a crafted message before authentication; and CVE-2026-27857 involves denial of service via a specially crafted NOOP command. These vulnerabilities could allow an attacker to disrupt service availability. Red Hat has issued patches for these vulnerabilities in Dovecot packages for Red Hat Enterprise Linux 10 and related variants.
Potential Impact
Successful exploitation of these vulnerabilities could cause denial of service conditions in the Dovecot server, potentially disrupting email services. There is no indication of code execution or data compromise. The impact is limited to service availability.
Mitigation Recommendations
Red Hat has released updated Dovecot packages for Red Hat Enterprise Linux 10 and its variants that address these vulnerabilities. Users should apply the security update as described in the Red Hat advisory RHSA-2026:13498 and the referenced article https://access.redhat.com/articles/11258. No additional mitigation is indicated or required beyond applying the official patches.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:13498
- Cve Count
- 3
- Additional Cves
- ["CVE-2026-27857","CVE-2026-27858"]
- Cvss Version
- null
Threat ID: 6a32cf7e9f87a2db092a948f
Added to database: 6/17/2026, 4:46:54 PM
Last enriched: 6/17/2026, 4:50:35 PM
Last updated: 6/17/2026, 6:22:56 PM
Views: 3
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