Improper Input Validation Affecting rabbitmq-server package, versions <4.3.2-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.43% (36th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-RABBITMQSERVER-20146817
  • published26 Sept 2026
  • disclosed25 Sept 2026

Introduced: 25 Sep 2026

NewCVE-2026-67234  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

Upgrade Debian:unstable rabbitmq-server to version 4.3.2-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rabbitmq-server package and not the rabbitmq-server package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

RabbitMQ is a messaging and streaming broker. From 4.2.0 until 4.2.8 and 4.3.2, get_auth_mechanism/1 used term_to_binary/1 on the strict_auth_mechanism or preferred_auth_mechanism atom when clearing the corresponding cookie, producing a non-ASCII cookie name that violates RFC 6265 and can prevent the browser from deleting the preference. The issue is not directly exploitable for code execution or data exfiltration; its security relevance is limited to stale authentication-mechanism preferences persisting across logout and login cycles. This issue is fixed in versions 4.2.8 and 4.3.2.

CVSS Base Scores

version 3.1