CVE-2026-67242

Name	CVE-2026-67242
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
rabbitmq-server (PTS)	bookworm, bookworm (security)	3.10.8-1.1+deb12u1	fixed
	trixie	4.0.5-6+deb13u2	fixed
	forky	4.3.2-4	vulnerable
	sid	4.3.2-5	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version
rabbitmq-server	source	bookworm	(not affected)
rabbitmq-server	source	trixie	(not affected)
rabbitmq-server	source	(unstable)	(unfixed)

Notes

[trixie] - rabbitmq-server <not-affected> (Vulnerable code not present, only affects 4.2.x and later)
[bookworm] - rabbitmq-server <not-affected> (Vulnerable code not present, only affects 4.2.x and later)
https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-rrj4-g94f-rqj9