Description
It was possible to cause a use-after-free in the content process side of a WebTransport connection, leading to a potentially exploitable crash. This vulnerability was fixed in Firefox 136, Firefox ESR 115.21, Firefox ESR 128.8, Thunderbird 136, and Thunderbird 128.8.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Mozilla Firefox
115.21 to ≤ 115.*unaffected128.8 to ≤ 128.*unaffected136 to ≤ *unaffected
Mozilla Thunderbird
128.8 to ≤ 128.*unaffected136 to ≤ *unaffected
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1944126 ↗
- https://www.mozilla.org/security/advisories/mfsa2025-14/ ↗
- https://www.mozilla.org/security/advisories/mfsa2025-15/ ↗
- https://www.mozilla.org/security/advisories/mfsa2025-16/ ↗
- https://www.mozilla.org/security/advisories/mfsa2025-17/ ↗
- https://www.mozilla.org/security/advisories/mfsa2025-18/ ↗
- https://lists.debian.org/debian-lts-announce/2025/03/msg00006.html ↗