CVE-2026-16241

Name	CVE-2026-16241
Description	Integer underflow in PostgreSQL ECPG allows a database server administrator to achieve temporary denial of service against the ECPG client via sending a bytea value lacking the mandatory prefix. The client overwrites a huge memory region with bytes outside attacker knowledge or control. This typically yields a simple SIGSEGV, but rare cases might achieve client-specific integrity impact via the write. Versions before PostgreSQL 18.6, 17.11, 16.15, 15.19, and 14.24 are affected.
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)
References	DLA-4740-1, DSA-6438-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
postgresql-15 (PTS)	bookworm	15.18-0+deb12u1	vulnerable
	bookworm (security)	15.19-0+deb12u1	fixed
postgresql-17 (PTS)	trixie	17.10-0+deb13u1	vulnerable
	trixie (security)	17.11-0+deb13u1	fixed
postgresql-18 (PTS)	forky, sid	18.6-3	fixed

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

Package	Type	Release	Fixed Version	Origin
postgresql-13	source	(unstable)	(unfixed)
postgresql-15	source	bookworm	15.19-0+deb12u1	DLA-4740-1
postgresql-15	source	(unstable)	(unfixed)
postgresql-17	source	trixie	17.11-0+deb13u1	DSA-6438-1
postgresql-17	source	(unstable)	(unfixed)
postgresql-18	source	(unstable)	18.6-1

Notes

https://www.postgresql.org/support/security/CVE-2026-16241/
https://www.postgresql.org/about/news/postgresql-186-1711-1615-1519-1424-and-19-beta-3-released-3365/