Description
The JavaScript engine did not handle closed generators correctly and it was possible to resume them leading to a nullptr deref. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Mozilla Firefox
115.26 to ≤ 115.*unaffected128.13 to ≤ 128.*unaffected140.1 to ≤ 140.*unaffected141 to ≤ *unaffected
Mozilla Thunderbird
128.13 to ≤ 128.*unaffected140.1 to ≤ 140.*unaffected141 to ≤ *unaffected
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1973990 ↗
- https://www.mozilla.org/security/advisories/mfsa2025-56/ ↗
- https://www.mozilla.org/security/advisories/mfsa2025-57/ ↗
- https://www.mozilla.org/security/advisories/mfsa2025-58/ ↗
- https://www.mozilla.org/security/advisories/mfsa2025-59/ ↗
- https://www.mozilla.org/security/advisories/mfsa2025-61/ ↗
- https://www.mozilla.org/security/advisories/mfsa2025-62/ ↗
- https://www.mozilla.org/security/advisories/mfsa2025-63/ ↗
- https://lists.debian.org/debian-lts-announce/2025/07/msg00016.html ↗