CVE-2026-6665

Name	CVE-2026-6665
Description	The SCRAM code in PgBouncer before 1.25.2 did not check the return value of strlcat() correctly when building the contents of the SCRAM client-final-message. A malicious backend that sends a SCRAM server-final-message with a long nonce can trigger a stack overflow.
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)
Debian Bugs	1136075

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
pgbouncer (PTS)	bullseye	1.15.0-1	vulnerable
	bullseye (security)	1.15.0-1+deb11u2	vulnerable
	bookworm	1.18.0-1+deb12u1	vulnerable
	trixie	1.24.1-1+deb13u1	vulnerable
	forky, sid	1.25.1-1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
pgbouncer	source	(unstable)	(unfixed)			1136075

Fixed by: https://github.com/pgbouncer/pgbouncer/commit/ab8dbb3b1a73b4a195062546e5e4f964b79f5b45 (pgbouncer_1_25_2)