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 to address these issues in Red Hat Enterprise Linux 9.2 variants.
AI Analysis
Technical Summary
Dovecot contains three denial of service vulnerabilities: CVE-2025-59032 allows denial of service through a crafted SASL initial response in the AUTHENTICATE command within the ManageSieve component; CVE-2026-27858 allows denial of service via a crafted message sent before authentication; and CVE-2026-27857 allows denial of service via a specially crafted NOOP command. These vulnerabilities can cause service disruption. Red Hat Product Security has released updated packages for Red Hat Enterprise Linux 9.2 to remediate these issues.
Potential Impact
Successful exploitation of these vulnerabilities can cause denial of service conditions in the Dovecot server, potentially disrupting email services. There is no indication of remote code execution or data compromise in the advisory. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Red Hat has released updated Dovecot packages for Red Hat Enterprise Linux 9.2 and its variants that fix these vulnerabilities. Users should apply the official Red Hat security update RHSA-2026:17628 to remediate these issues. Detailed update instructions are available from Red Hat at https://access.redhat.com/articles/11258. No other mitigation actions are specified or required.
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 to address these issues in Red Hat Enterprise Linux 9.2 variants.
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Dovecot contains three denial of service vulnerabilities: CVE-2025-59032 allows denial of service through a crafted SASL initial response in the AUTHENTICATE command within the ManageSieve component; CVE-2026-27858 allows denial of service via a crafted message sent before authentication; and CVE-2026-27857 allows denial of service via a specially crafted NOOP command. These vulnerabilities can cause service disruption. Red Hat Product Security has released updated packages for Red Hat Enterprise Linux 9.2 to remediate these issues.
Potential Impact
Successful exploitation of these vulnerabilities can cause denial of service conditions in the Dovecot server, potentially disrupting email services. There is no indication of remote code execution or data compromise in the advisory. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Red Hat has released updated Dovecot packages for Red Hat Enterprise Linux 9.2 and its variants that fix these vulnerabilities. Users should apply the official Red Hat security update RHSA-2026:17628 to remediate these issues. Detailed update instructions are available from Red Hat at https://access.redhat.com/articles/11258. No other mitigation actions are specified or required.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:17628
- Cve Count
- 3
- Additional Cves
- ["CVE-2026-27857","CVE-2026-27858"]
- Cvss Version
- null
Threat ID: 6a32cf7e9f87a2db092a943a
Added to database: 6/17/2026, 4:46:54 PM
Last enriched: 6/17/2026, 4:51:18 PM
Last updated: 6/17/2026, 6:22:27 PM
Views: 2
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