CVE-2026-113869

Name	CVE-2026-113869
Description	When Thunderbird asked for a security device password (for example a smartcard PIN or the Primary Password) while decrypting an S/MIME message, the message load could finish or be cancelled while the prompt was open. This freed the message decoder while it was still in use, causing a use-after-free and a potentially exploitable crash. This vulnerability was fixed in Thunderbird 158.0.1.
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
thunderbird (PTS)	bookworm	1:140.12.0esr-1~deb12u1	fixed
	bookworm (security)	1:140.17.0esr-1~deb12u1	fixed
	trixie	1:140.12.0esr-1~deb13u1	fixed
	trixie (security)	1:140.17.0esr-1~deb13u1	fixed
	forky, sid	1:153.5.0esr-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
thunderbird	source	(unstable)	(not affected)

- thunderbird <not-affected> (Only affects Thunderbird post ESR153)
https://www.mozilla.org/en-US/security/advisories/mfsa2026-114/#CVE-2026-113869