Use of Expired File Descriptor Affecting dovecot-pgsql package, versions <1:2.3.21-19.el10_2.8


Severity

Recommended
0.0
high
0
10

Based on CentOS security rating.

Threat Intelligence

EPSS
0.55% (45th percentile)

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  • Snyk IDSNYK-CENTOS10-DOVECOTPGSQL-19481467
  • published2 Sept 2026
  • disclosed28 Aug 2026

Introduced: 28 Aug 2026

CVE-2026-33263  (opens in a new tab)
CWE-910  (opens in a new tab)

How to fix?

Upgrade Centos:10 dovecot-pgsql to version 1:2.3.21-19.el10_2.8 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream dovecot-pgsql package and not the dovecot-pgsql package as distributed by Centos. See How to fix? for Centos:10 relevant fixed versions and status.

When mail_max_userip_connections is set (default 10) and reached, submission-login can crash with epoll() panic caused by file descriptor handling issues. If running in high-security mode (default for community releases), only the new submission connection gets terminated. If running in high-performance mode (default for Pro releases), all connections handled by the submission-login process will be terminated. The crashes can cause failure for user to send a message, or it can cause duplicate messages to be sent. If TLS is not used (in the backend server processing the submission), duplicate deliveries cannot happen, because the crash can only happen at AUTH stage. Limit the number of connections handled by single submission-login process. This has a performance impact though. Update to non-vulnerable version. No publicly available exploits are known.

CVSS Base Scores

version 3.1