CVE-2026-89134

Name	CVE-2026-89134
Description	A certificate with no dNSName SAN but another SAN type present (e.g. registeredID or iPAddress) bypassed the Subject CN dNSName name-constraint check. The CN-as-DNS fallback was gated on cert->subjectCN != NULL && cert->altNames == NULL && !cert->isCA instead of "no dNSName SAN", so an out-of-scope CN was accepted. This incomplete fix from CVE-2026-6731, leading to the name-constraint check issue, was introduced in wolfSSL version 5.9.2.
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)
Debian Bugs	1150338

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
wolfssl (PTS)	bookworm	5.5.4-2+deb12u2	vulnerable
	bookworm (security)	5.5.4-2+deb12u3	vulnerable
	trixie	5.7.2-0.1+deb13u2	vulnerable
	sid	5.9.2-1.2	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
wolfssl	source	bookworm	(unfixed)	end-of-life
wolfssl	source	(unstable)	5.9.2-1.1			1150338

Notes

[trixie] - wolfssl <no-dsa> (Minor issue)
[bookworm] - wolfssl <end-of-life> (EOL in bookworm LTS)
https://github.com/wolfSSL/wolfssl/pull/10837 (v5.9.4-stable)