CVE-2026-120678

Name	CVE-2026-120678
Description	A memory management flaw in the MongoDB C Driver's handling of compressed responses may cause the client library to hold on to memory that is never released. An unauthenticated party that controls the database endpoint a client application connects to may cause repeated, unbounded memory growth in that application, which may result in the application becoming unavailable. No credentials, transport security settings, or user interaction are required.
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
mongo-c-driver (PTS)	bookworm	1.23.1-1+deb12u3	vulnerable
	trixie	1.30.4-1+deb13u3	vulnerable
	forky	2.5.7-1	vulnerable
	sid	2.5.8-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
mongo-c-driver	source	(unstable)	2.5.8-1

Notes

https://jira.mongodb.org/browse/CDRIVER-6521
Fixed by: https://github.com/mongodb/mongo-c-driver/commit/e4394fb21880d360ab6b36855353a455d2127a2f (2.5.8)
Fixed by: https://github.com/mongodb/mongo-c-driver/commit/40733d2100cbed890008042e8bb8ab80c8f9249f (1.30.15)