{"id":"CVE-2026-12309","published":"2026-06-16T11:52:42Z","modified":"2026-10-21T13:50:02Z","title":"Memory safety bug fixed in Thunderbird 152","vendor":"Mozilla","product":"Firefox","tier":"tail","description":{"text":"Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.","provenance":"source","from":"CVE.org"},"cvss":{"score":6.5,"severity":"MEDIUM","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","provenance":"source","from":"CISA ADP Vulnrichment"},"epss":{"score":0.00235,"percentile":0.14434,"provenance":"source"},"cwes":[{"id":"CWE-119","name":"Improper Restriction of Operations within the Bounds of a Memory Buffer"}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2038476","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-57/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-58/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-60/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-61/","tags":[]}],"priority":{"score":7.4,"factors":[{"name":"EPSS percentile","points":2.89},{"name":"CVSS severity","points":4.55}]},"vendorSlug":"mozilla","euvd":{"id":"EUVD-2026-37100","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-class-mozilla-firefox-cwe-119"}}