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 a denial of service via a crafted SASL initial response in the AUTHENTICATE command (CVE-2025-59032), denial of service via a crafted message before authentication (CVE-2026-27858), and denial of service via a specially crafted NOOP command (CVE-2026-27857). Red Hat has issued an important security advisory with updates for Red Hat Enterprise Linux 10.0 Extended Update Support to address these issues.
AI Analysis
Technical Summary
Dovecot contains multiple denial of service vulnerabilities affecting its ManageSieve and core IMAP/POP3 functionality. Specifically, CVE-2025-59032 involves a denial of service triggered by a crafted SASL initial response during the AUTHENTICATE command. CVE-2026-27858 and CVE-2026-27857 involve denial of service conditions triggered by crafted messages before authentication and specially crafted NOOP commands, respectively. Red Hat has released security updates for Red Hat Enterprise Linux 10.0 Extended Update Support to remediate these issues.
Potential Impact
Successful exploitation of these vulnerabilities can cause denial of service conditions in the Dovecot server, potentially disrupting email service availability. There is no indication of privilege escalation, data disclosure, or code execution. No known exploits in the wild have been reported.
Mitigation Recommendations
Red Hat has published security updates for Dovecot in Red Hat Enterprise Linux 10.0 Extended Update Support addressing these vulnerabilities. Users should apply the available updates as described in Red Hat advisory RHSA-2026:17602 and the referenced article https://access.redhat.com/articles/11258. Patch status is confirmed with official fixes available. No additional mitigation steps are indicated by the vendor.
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 a denial of service via a crafted SASL initial response in the AUTHENTICATE command (CVE-2025-59032), denial of service via a crafted message before authentication (CVE-2026-27858), and denial of service via a specially crafted NOOP command (CVE-2026-27857). Red Hat has issued an important security advisory with updates for Red Hat Enterprise Linux 10.0 Extended Update Support to address these issues.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Dovecot contains multiple denial of service vulnerabilities affecting its ManageSieve and core IMAP/POP3 functionality. Specifically, CVE-2025-59032 involves a denial of service triggered by a crafted SASL initial response during the AUTHENTICATE command. CVE-2026-27858 and CVE-2026-27857 involve denial of service conditions triggered by crafted messages before authentication and specially crafted NOOP commands, respectively. Red Hat has released security updates for Red Hat Enterprise Linux 10.0 Extended Update Support to remediate these issues.
Potential Impact
Successful exploitation of these vulnerabilities can cause denial of service conditions in the Dovecot server, potentially disrupting email service availability. There is no indication of privilege escalation, data disclosure, or code execution. No known exploits in the wild have been reported.
Mitigation Recommendations
Red Hat has published security updates for Dovecot in Red Hat Enterprise Linux 10.0 Extended Update Support addressing these vulnerabilities. Users should apply the available updates as described in Red Hat advisory RHSA-2026:17602 and the referenced article https://access.redhat.com/articles/11258. Patch status is confirmed with official fixes available. No additional mitigation steps are indicated by the vendor.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:17602
- Cve Count
- 3
- Additional Cves
- ["CVE-2026-27857","CVE-2026-27858"]
- Cvss Version
- null
Threat ID: 6a32cf7e9f87a2db092a9476
Added to database: 6/17/2026, 4:46:54 PM
Last enriched: 6/17/2026, 4:50:57 PM
Last updated: 6/17/2026, 6:23:02 PM
Views: 3
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