CVE-2025-2830

Name	CVE-2025-2830
Description	By crafting a malformed file name for an attachment in a multipart message, an attacker can trick Thunderbird into including a directory listing of /tmp when the message is forwarded or edited as a new message. This vulnerability could allow attackers to disclose sensitive information from the victim's system. This vulnerability is not limited to Linux; similar behavior has been observed on Windows as well. This vulnerability affects Thunderbird < 137.0.2 and Thunderbird < 128.9.2.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, 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)	bullseye	1:115.12.0-1~deb11u1	vulnerable
	bullseye (security)	1:128.9.0esr-1~deb11u1	vulnerable
	bookworm	1:128.8.0esr-1~deb12u1	vulnerable
	bookworm (security)	1:128.9.0esr-1~deb12u1	vulnerable
	sid, trixie	1:128.9.0esr-1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
thunderbird	source	(unstable)	(unfixed)

Notes

[bookworm] - thunderbird <postponed> (Fix along with May security release)
https://www.mozilla.org/en-US/security/advisories/mfsa2025-27/#CVE-2025-2830