Red Hat Security Advisory: dovecot security update
A denial of service vulnerability (CVE-2026-42006) exists in Dovecot, an IMAP server for Linux and UNIX-like systems, caused by excessive IMAP bracing. This vulnerability can cause the Dovecot service to become unavailable. Red Hat has issued a security advisory with an update to address this issue in Red Hat Enterprise Linux 10.0 Extended Update Support. The update fixes the vulnerability by mitigating the excessive IMAP bracing condition.
AI Analysis
Technical Summary
CVE-2026-42006 is a denial of service vulnerability in Dovecot related to excessive IMAP bracing. Dovecot is an IMAP and POP3 server supporting maildir and mbox formats. The vulnerability allows an attacker to cause a denial of service by exploiting the excessive IMAP bracing behavior. Red Hat has released a security update for Red Hat Enterprise Linux 10.0 Extended Update Support to fix this issue. The advisory references Bugzilla 2476476 as the fix and provides updated package versions for multiple architectures. No CVSS score is provided in the advisory.
Potential Impact
Successful exploitation of this vulnerability can cause a denial of service condition in the Dovecot IMAP server, leading to service unavailability. There is no indication of code execution or data compromise. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Red Hat has released an official security update for Dovecot in Red Hat Enterprise Linux 10.0 Extended Update Support that addresses this vulnerability. Users should apply the update as described in the Red Hat advisory (RHSA-2026:42091) to remediate the issue. Details on applying the update are available at https://access.redhat.com/articles/11258. No additional mitigation steps are indicated by the vendor.
Red Hat Security Advisory: dovecot security update
Description
A denial of service vulnerability (CVE-2026-42006) exists in Dovecot, an IMAP server for Linux and UNIX-like systems, caused by excessive IMAP bracing. This vulnerability can cause the Dovecot service to become unavailable. Red Hat has issued a security advisory with an update to address this issue in Red Hat Enterprise Linux 10.0 Extended Update Support. The update fixes the vulnerability by mitigating the excessive IMAP bracing condition.
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-42006 is a denial of service vulnerability in Dovecot related to excessive IMAP bracing. Dovecot is an IMAP and POP3 server supporting maildir and mbox formats. The vulnerability allows an attacker to cause a denial of service by exploiting the excessive IMAP bracing behavior. Red Hat has released a security update for Red Hat Enterprise Linux 10.0 Extended Update Support to fix this issue. The advisory references Bugzilla 2476476 as the fix and provides updated package versions for multiple architectures. No CVSS score is provided in the advisory.
Potential Impact
Successful exploitation of this vulnerability can cause a denial of service condition in the Dovecot IMAP server, leading to service unavailability. There is no indication of code execution or data compromise. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Red Hat has released an official security update for Dovecot in Red Hat Enterprise Linux 10.0 Extended Update Support that addresses this vulnerability. Users should apply the update as described in the Red Hat advisory (RHSA-2026:42091) to remediate the issue. Details on applying the update are available at https://access.redhat.com/articles/11258. 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-2026:42091
- Cve Count
- 1
- Additional Cves
- []
- Cvss Version
- null
Threat ID: 6a5e79ed2a4a8d59899bb941
Added to database: 07/20/2026, 19:41:33 UTC
Last enriched: 07/20/2026, 19:47:12 UTC
Last updated: 07/21/2026, 09:41:15 UTC
Views: 14
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