CVE-2026-67234 (GCVE-0-2026-67234)

Vulnerability from cvelistv5 – Published: 2026-09-25 16:03 – Updated: 2026-09-25 19:53
VLAI
Title
RabbitMQ: Non-RFC-conformant cookie name when clearing the auth-mechanism preference
Summary
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.
Severity
2.3 (Low)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-25 19:53 UTC
CWE
  • CWE-20 - Improper Input Validation
Assigner
References
Impacted products
Vendor Product Version CPE status
rabbitmq rabbitmq-server Affected: >= 4.2.0, < 4.2.8
Affected: >= 4.3.0, < 4.3.2
guessed Create a notification for this product.
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