CRLF Injection Affecting dovecot-mysql package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.34% (25th percentile)

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  • Snyk IDSNYK-RHEL8-DOVECOTMYSQL-19733940
  • published13 Sept 2026
  • disclosed28 Aug 2026

Introduced: 28 Aug 2026

NewCVE-2026-33604  (opens in a new tab)
CWE-93  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:8 dovecot-mysql.

NVD Description

Note: Versions mentioned in the description apply only to the upstream dovecot-mysql package and not the dovecot-mysql package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

An attacker that can get Dovecot to relay a message, for example through Sieve redirect or submission relay, can use a crafted line ending in the message body to bypass the outbound protection that prevents message content from being interpreted as SMTP commands. A downstream mail server that hasn't yet fixed the SMTP smuggling vulnerability can be tricked into treating part of the message body as new SMTP commands, allowing injection of spoofed email. This is the same vulnerability class as CVE-2023-51764 and CVE-2023-51766. Where you control the receiving mail servers, ensure they reject bare carriage returns in message data. Update to non-vulnerable version. No publicly available exploits are known.

CVSS Base Scores

version 3.1