CVE-2026-69248

Name	CVE-2026-69248
Description	cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior to 49.0.0, if an intermediate constrained CA permits the DNS name foo.example.com, and the leaf certificate has a wildcard in its DNS SAN of .example.com, python-cryptography's verifier accepts which allows escaping outside of the permitted names. The core issue is in DNSConstraint::matches, where a wildcard pattern was treated as matching a more-specific permitted constraint even though .example.com can expand to sibling names such as bar.example.com outside foo.example.com. This allows acceptance of an invalid certificate chain. This issue is fixed in 49.0.0.
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	47.0.0-1	vulnerable
	sid	49.0.0-1	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)	49.0.0-1

Notes

https://github.com/pyca/cryptography/security/advisories/GHSA-m2h6-j472-rp4c
https://github.com/pyca/cryptography/pull/14888
Fixed by: https://github.com/pyca/cryptography/commit/4d035a4225965edeffd312079a510ef25fcfdcb2 (49.0.0)