{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-12327: Memory safety bugs fixed in Firefox ESR 140.12, Thunderbird ESR 140.12, Firefox 152 and Thunderbird 152","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-12327","status":"final","version":"1","initial_release_date":"2026-06-16T11:53:00.798Z","current_release_date":"2026-06-16T16:08:45.759Z","revision_history":[{"date":"2026-06-16T11:53:00.798Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"Memory safety bugs present in Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151. 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 was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-12327 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-12327"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-12327"},{"category":"external","summary":"Moderate Severity memory safety bugs fixed in Firefox ESR 140.12, Thunderbird ESR 140.12, Firefox 152 and Thunderbird 152","url":"https://bugzilla.mozilla.org/buglist.cgi?bug_id=2011842%2C2023902%2C2025512%2C2027312%2C2029444%2C2036571%2C2036900%2C2036936%2C2037995%2C2038551%2C2040717%2C2042724"},{"category":"external","summary":"mozilla.org","url":"https://www.mozilla.org/security/advisories/mfsa2026-57/"},{"category":"external","summary":"mozilla.org","url":"https://www.mozilla.org/security/advisories/mfsa2026-58/"},{"category":"external","summary":"mozilla.org","url":"https://www.mozilla.org/security/advisories/mfsa2026-60/"},{"category":"external","summary":"mozilla.org","url":"https://www.mozilla.org/security/advisories/mfsa2026-61/"}]},"product_tree":{"branches":[{"category":"vendor","name":"Mozilla","branches":[{"category":"product_name","name":"Firefox","branches":[{"category":"product_version","name":"*","product":{"name":"Mozilla Firefox *","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"140.12","product":{"name":"Mozilla Firefox 140.12","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"152","product":{"name":"Mozilla Firefox 152","product_id":"CSAFPID-3","product_identification_helper":{"cpe":"cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Mozilla","branches":[{"category":"product_name","name":"Thunderbird","branches":[{"category":"product_version","name":"*","product":{"name":"Mozilla Thunderbird *","product_id":"CSAFPID-4","product_identification_helper":{"cpe":"cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"140.12","product":{"name":"Mozilla Thunderbird 140.12","product_id":"CSAFPID-5","product_identification_helper":{"cpe":"cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"152","product":{"name":"Mozilla Thunderbird 152","product_id":"CSAFPID-6","product_identification_helper":{"cpe":"cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-12327","title":"Memory safety bugs fixed in Firefox ESR 140.12, Thunderbird ESR 140.12, Firefox 152 and Thunderbird 152","notes":[{"category":"description","text":"Memory safety bugs present in Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151. 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 was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1","CSAFPID-4"],"fixed":["CSAFPID-2","CSAFPID-3","CSAFPID-5","CSAFPID-6"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","baseScore":7.3,"baseSeverity":"HIGH"},"products":["CSAFPID-1","CSAFPID-4"]}],"remediations":[{"category":"vendor_fix","details":"Update to a fixed version: 140.12, 152.","product_ids":["CSAFPID-1","CSAFPID-4"]}]}]}