CVE-2025-11711

Name	CVE-2025-11711
Description	There was a way to change the value of JavaScript Object properties that were supposed to be non-writeable. This vulnerability affects Firefox < 144, Firefox ESR < 115.29, Firefox ESR < 140.4, Thunderbird < 144, and Thunderbird < 140.4.
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	DSA-6025-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
firefox (PTS)	sid	144.0-1	fixed
firefox-esr (PTS)	bullseye	115.14.0esr-1~deb11u1	vulnerable
	bullseye (security)	140.3.1esr-1~deb11u1	vulnerable
	bookworm	128.14.0esr-1~deb12u1	vulnerable
	bookworm (security)	140.4.0esr-1~deb12u1	fixed
	trixie	128.14.0esr-1~deb13u1	vulnerable
	trixie (security)	140.4.0esr-1~deb13u1	fixed
	forky	140.3.1esr-2	vulnerable
	sid	140.4.0esr-1	fixed
thunderbird (PTS)	bullseye	1:115.12.0-1~deb11u1	vulnerable
	bullseye (security)	1:140.3.0esr-1~deb11u1	vulnerable
	bookworm	1:128.14.0esr-1~deb12u1	vulnerable
	bookworm (security)	1:140.3.0esr-1~deb12u1	vulnerable
	trixie	1:128.14.0esr-1~deb13u1	vulnerable
	trixie (security)	1:140.3.0esr-1~deb13u1	vulnerable
	forky, sid	1:140.3.1esr-1	vulnerable

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

Package	Type	Release	Fixed Version	Origin
firefox	source	(unstable)	144.0-1
firefox-esr	source	bookworm	140.4.0esr-1~deb12u1	DSA-6025-1
firefox-esr	source	trixie	140.4.0esr-1~deb13u1	DSA-6025-1
firefox-esr	source	(unstable)	140.4.0esr-1
thunderbird	source	(unstable)	(unfixed)

Notes

https://www.mozilla.org/en-US/security/advisories/mfsa2025-81/#CVE-2025-11711
https://www.mozilla.org/en-US/security/advisories/mfsa2025-83/#CVE-2025-11711
https://www.mozilla.org/en-US/security/advisories/mfsa2025-85/#CVE-2025-11711