CVE-2026-96746

Name	CVE-2026-96746
Description	An out-of-bounds write in the connection-monitoring logic of the MongoDB C Driver may allow an unauthenticated party who controls name resolution and the responses of the hosts named in a client's connection string to write beyond the end of a heap buffer. This may cause the application using the driver to terminate unexpectedly.
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, sid	2.5.6-1	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)	2.5.5-1

Notes

[trixie] - mongo-c-driver <no-dsa> (Minor issue)
https://github.com/mongodb/mongo-c-driver/security/advisories/GHSA-frjf-h5jg-4v46
https://jira.mongodb.org/browse/CDRIVER-6404
https://github.com/mongodb/mongo-c-driver/commit/52352bfdea96506fafe0f53e222a1f61eebe54f2 (2.5.5)
https://github.com/mongodb/mongo-c-driver/commit/59bcc756ad8f04af74b84b88ab747adfd2647b5b (1.30.12)