CVE-2025-11708: Use-after-free in MediaTrackGraphImpl::GetInstance()

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-10-14 · updated 2026-10-23
Weakness: CWE-416

Description

Use-after-free in MediaTrackGraphImpl::GetInstance(). This vulnerability was fixed in Firefox 144, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4.

Affected products

Mozilla Firefox: before 140.4.0; before 144.0 — fixed in 140.4.0, 144.0
Mozilla Thunderbird: before 140.4.0; from 141.0 before 144.0 — fixed in 140.4.0, 144.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 140.4.0, 144.0; Mozilla Thunderbird 140.4.0, 144.0. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1988931
https://www.mozilla.org/security/advisories/mfsa2025-81/
https://www.mozilla.org/security/advisories/mfsa2025-83/
https://www.mozilla.org/security/advisories/mfsa2025-84/
https://www.mozilla.org/security/advisories/mfsa2025-85/
https://lists.debian.org/debian-lts-announce/2025/10/msg00015.html
https://lists.debian.org/debian-lts-announce/2025/10/msg00031.html

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