CVE-2026-67242

CVE-2026-67242 · RabbitMQ: OAuth2 is_integer(Exp) guard skips token-expiry checks for float exp

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 6.3 · Medium · EPSS 0.3% · Fix available

Published

2026-09-25T16:16:14.558Z

Updated

2026-09-25T20:01:12.537Z

Stack: system · database

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