Certificate length was not properly checked when added to a certificate store. In practice only trusted data was processed. This vulnerability was fixed in Firefox 135, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.
https://www.mozilla.org/security/advisories/mfsa2025-11/
https://www.mozilla.org/security/advisories/mfsa2025-10/
https://www.mozilla.org/security/advisories/mfsa2025-09/
https://www.mozilla.org/security/advisories/mfsa2025-07/
https://lists.debian.org/debian-lts-announce/2025/02/msg00006.html