CVE-2026-67242 (GCVE-0-2026-67242)

Vulnerability from cvelistv5 – Published: 2026-09-25 16:16 – Updated: 2026-09-25 20:01
VLAI
Title
RabbitMQ: OAuth2 is_integer(Exp) guard skips token-expiry checks for float exp
Summary
RabbitMQ is a messaging and streaming broker. From 4.2.0 until 4.2.9 and 4.3.3, OAuth2 isinteger(Exp) guard skips token-expiry checks for float exp. validatetokenexpiry/1 (lines 208-214) and expirytimestamp/1 (138-144) both guard with 'when isinteger(Exp)' and fall through to ok/never for float values. josejwt:verify validates only the signature, not exp. With float exp, no expiry validation occurs anywhere in the If the IdP emits exp as a JSON float (RFC 7519 permits fractional NumericDate), both the login-time expiry check and the mid-connection disconnect timer are silently skipped , an already-expired token is accepted, and connections never time OAuth2 backend enabled IdP emits float exp (uncommon; mainstream IdPs emit integers) Attacker possesses a previously-valid signed. This issue is fixed in versions 4.2.9 and 4.3.3.
Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-25 20:01 UTC
CWE
  • CWE-613 - Insufficient Session Expiration
Assigner
References
Impacted products
Vendor Product Version CPE status
rabbitmq rabbitmq-server Affected: >= 4.2.0, < 4.2.9
Affected: >= 4.3.0, < 4.3.3
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