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 a security advisory with updates for affected Red Hat Enterprise Linux 8.8 variants to address these issues.
AI Analysis
Technical Summary
Dovecot, a secure IMAP and POP3 server, contains three denial of service vulnerabilities: CVE-2025-59032 involves a crafted SASL initial response in the AUTHENTICATE command affecting ManageSieve; CVE-2026-27858 involves a crafted message before authentication; and CVE-2026-27857 involves a specially crafted NOOP command. These vulnerabilities can cause the service to become unavailable. Red Hat has released updated packages for Red Hat Enterprise Linux 8.8 variants to fix these issues as detailed in advisory RHSA-2026:18053.
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 remote code execution. No known exploits in the wild have been reported.
Mitigation Recommendations
Red Hat has released updated Dovecot packages for Red Hat Enterprise Linux 8.8 variants that address these denial of service vulnerabilities. Users should apply the updates as described in Red Hat advisory RHSA-2026:18053 and the referenced article https://access.redhat.com/articles/11258. No additional mitigations are specified 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 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 a security advisory with updates for affected Red Hat Enterprise Linux 8.8 variants to address these issues.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Dovecot, a secure IMAP and POP3 server, contains three denial of service vulnerabilities: CVE-2025-59032 involves a crafted SASL initial response in the AUTHENTICATE command affecting ManageSieve; CVE-2026-27858 involves a crafted message before authentication; and CVE-2026-27857 involves a specially crafted NOOP command. These vulnerabilities can cause the service to become unavailable. Red Hat has released updated packages for Red Hat Enterprise Linux 8.8 variants to fix these issues as detailed in advisory RHSA-2026:18053.
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 remote code execution. No known exploits in the wild have been reported.
Mitigation Recommendations
Red Hat has released updated Dovecot packages for Red Hat Enterprise Linux 8.8 variants that address these denial of service vulnerabilities. Users should apply the updates as described in Red Hat advisory RHSA-2026:18053 and the referenced article https://access.redhat.com/articles/11258. No additional mitigations are specified 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-2026:18053
- Cve Count
- 3
- Additional Cves
- ["CVE-2026-27857","CVE-2026-27858"]
- Cvss Version
- null
Threat ID: 6a32cf7e9f87a2db092a9401
Added to database: 6/17/2026, 4:46:54 PM
Last enriched: 6/17/2026, 5:05:05 PM
Last updated: 6/17/2026, 7:44:32 PM
Views: 5
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