CVE-2025-3875

Name	CVE-2025-3875
Description	Thunderbird parses addresses in a way that can allow sender spoofing in case the server allows an invalid From address to be used. For example, if the From header contains an (invalid) value "Spoofed Name ", Thunderbird treats spoofed@example.com as the actual address. This vulnerability affects Thunderbird < 128.10.1 and Thunderbird < 138.0.1.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-4167-1, DSA-5921-1

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)	1:128.14.0esr-1~deb11u1	fixed
	bookworm, bookworm (security)	1:128.14.0esr-1~deb12u1	fixed
	trixie (security), trixie	1:128.14.0esr-1~deb13u1	fixed
	forky, sid	1:128.14.0esr-1	fixed

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

Package	Type	Release	Fixed Version	Origin
thunderbird	source	bullseye	1:128.10.1esr-1~deb11u1	DLA-4167-1
thunderbird	source	bookworm	1:128.10.1esr-1~deb12u1	DSA-5921-1
thunderbird	source	(unstable)	1:128.10.1esr-1

https://www.mozilla.org/en-US/security/advisories/mfsa2025-34/#CVE-2025-3875