{"schemaVersion":2,"id":"CVE-2026-109727","aliases":["DEBIAN-CVE-2026-109727"],"status":"published","duplicateOf":null,"title":null,"description":"Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.","dates":{"published":"2026-10-13T12:29:20.048Z","modified":"2026-10-13T18:16:35.999Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.4,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":5.4,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":5.4,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":5.4,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","exploitability":7.2,"impact":4.2,"computed":true}]},"epss":{"probability":0.00228,"percentile":0.12567,"severity":"low","asOf":"2026-10-15T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-10-14T00:00:00.000Z","score":0.00228,"percentile":0.12562},{"date":"2026-10-15T00:00:00.000Z","score":0.00228,"percentile":0.12567}],"last30":[{"date":"2026-10-14T00:00:00.000Z","score":0.00228,"percentile":0.12562},{"date":"2026-10-15T00:00:00.000Z","score":0.00228,"percentile":0.12567}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-416","name":"Use After Free","description":"The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory \"belongs\" to the code that operates on the new pointer.","type":"weakness","status":"Stable","abstraction":"Variant","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/416.html","capec":[],"techniques":[],"countermeasures":[]}],"ttp":{"capecs":[],"techniques":[],"countermeasures":[],"countermeasuresByTactic":[]},"affected":[{"vendor":"debian","product":"firefox-esr","name":"firefox-esr","label":"firefox-esr","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/firefox-esr","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 153.5.0esr-1~deb12u1","noFixRecorded":false,"fixedIn":null},{"text":"< 153.5.0esr-1~deb13u1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 153.5.0esr-1~deb12u1 | < 153.5.0esr-1~deb13u1","eol":null},{"vendor":"debian","product":"thunderbird","name":"thunderbird","label":"thunderbird","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/thunderbird","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2074213","label":"bugzilla.mozilla.org/show_bug.cgi?id=2074213","hostname":"bugzilla.mozilla.org","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-106/","label":"www.mozilla.org/security/advisories/mfsa2026-106/","hostname":"www.mozilla.org","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-107/","label":"www.mozilla.org/security/advisories/mfsa2026-107/","hostname":"www.mozilla.org","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-108/","label":"www.mozilla.org/security/advisories/mfsa2026-108/","hostname":"www.mozilla.org","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-109/","label":"www.mozilla.org/security/advisories/mfsa2026-109/","hostname":"www.mozilla.org","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-110/","label":"www.mozilla.org/security/advisories/mfsa2026-110/","hostname":"www.mozilla.org","tags":[]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-109727","label":"security-tracker.debian.org/tracker/CVE-2026-109727","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2026:12116-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:12116-1"]},"timeline":[{"kind":"published","date":"2026-10-13T12:29:20.048Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-13T18:16:35.999Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":22,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-16T00:39:38.440Z","stale":false,"partial":false}}