CVE-2026-106433

Name	CVE-2026-106433
Description	Improper state management in MongoDB libmongocrypt can cause provider-specific data to be treated as an incompatible type when cleaning up a key document containing duplicate masterKey fields. An authenticated actor who can modify key vault documents, or a server that returns such a key document, can cause invalid memory access and invalid frees in the client process. This can terminate the application or corrupt process memory.
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
libmongocrypt (PTS)	bookworm	1.7.2-1	vulnerable
	trixie	1.13.2-1+deb13u1	vulnerable
	forky	1.20.4-1	vulnerable
	sid	1.20.5-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libmongocrypt	source	(unstable)	1.20.5-1

Notes

https://jira.mongodb.org/browse/MONGOCRYPT-964
Fixed by: https://github.com/mongodb/libmongocrypt/commit/556bcb70b6efecb7f568d824b03469df3a3bc91a (1.20.5)
Fixed by: https://github.com/mongodb/libmongocrypt/commit/8bc580ea69eea13a932197221edf72830fbc38a1 (1.20.5)