{"id":"CVE-2026-0891","details":"Memory safety bugs present in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox \u003c 147, Firefox ESR \u003c 140.7, Thunderbird \u003c 147, and Thunderbird \u003c 140.7.","modified":"2026-04-16T04:32:29.362965776Z","published":"2026-01-13T14:16:39.627Z","related":["ALSA-2026:0667","ALSA-2026:0694","ALSA-2026:0924","ALSA-2026:2220","ALSA-2026:2271","ALSA-2026:2286","SUSE-SU-2026:0122-1","SUSE-SU-2026:0153-1","SUSE-SU-2026:0260-1","SUSE-SU-2026:20086-1","openSUSE-SU-2026:10037-1","openSUSE-SU-2026:10046-1","openSUSE-SU-2026:10058-1","openSUSE-SU-2026:20041-1","openSUSE-SU-2026:20391-1"],"references":[{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2026-01/"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2026-03/"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2026-04/"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2026-05/"},{"type":"REPORT","url":"https://bugzilla.mozilla.org/buglist.cgi?bug_id=1964722%2C2000981%2C2003100%2C2003278"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"140.7.0"}]},{"events":[{"introduced":"0"},{"fixed":"147.0"}]},{"events":[{"introduced":"0"},{"fixed":"140.7.0"}]},{"events":[{"introduced":"0"},{"fixed":"147.0"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-0891.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}