CVE-2026-34073

Name	CVE-2026-34073
Description	cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior to version 46.0.6, DNS name constraints were only validated against SANs within child certificates, and not the "peer name" presented during each validation. Consequently, cryptography would allow a peer named bar.example.com to validate against a wildcard leaf certificate for *.example.com, even if the leaf's parent certificate (or upwards) contained an excluded subtree constraint for bar.example.com. This issue has been patched in version 46.0.6.
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
python-cryptography (PTS)	bullseye	3.3.2-1	vulnerable
	bullseye (security)	3.3.2-1+deb11u1	vulnerable
	bookworm	38.0.4-3+deb12u1	vulnerable
	bookworm (security)	38.0.4-3~deb12u1	vulnerable
	trixie	43.0.0-3+deb13u1	vulnerable
	forky	46.0.5-2	vulnerable
	sid	46.0.6-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
python-cryptography	source	(unstable)	46.0.6-1

https://github.com/pyca/cryptography/security/advisories/GHSA-m959-cc7f-wv43