{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-117920", "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "state": "PUBLISHED", "assignerShortName": "mozilla", "dateReserved": "2026-10-27T14:05:25.590Z", "datePublished": "2026-10-27T14:05:25.763Z", "dateUpdated": "2026-10-27T18:29:00.904Z"}, "containers": {"cna": {"affected": [{"product": "Firefox", "vendor": "Mozilla", "versions": [{"status": "unaffected", "version": "153.6", "lessThanOrEqual": "153.*", "versionType": "rpm"}, {"status": "unaffected", "version": "159", "lessThanOrEqual": "*", "versionType": "rpm"}]}, {"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"status": "unaffected", "version": "153.6", "lessThanOrEqual": "153.*", "versionType": "rpm"}, {"status": "unaffected", "version": "159", "lessThanOrEqual": "*", "versionType": "rpm"}]}], "descriptions": [{"lang": "en", "value": "Use-after-free in the DOM: HTML Parser component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Use-after-free in the DOM: HTML Parser component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6."}]}], "title": "Use-after-free in the DOM: HTML Parser component", "references": [{"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2079681"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-118/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-120/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-121/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-122/"}], "credits": [{"lang": "en", "value": "Mozilla"}], "providerMetadata": {"orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "shortName": "mozilla", "dateUpdated": "2026-10-27T18:29:00.904Z"}}}}

{}

{"affected": [{"affectedData": [{"product": "Firefox", "vendor": "Mozilla", "versions": [{"lessThanOrEqual": "153.*", "status": "unaffected", "version": "153.6", "versionType": "rpm"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "159", "versionType": "rpm"}]}, {"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"lessThanOrEqual": "153.*", "status": "unaffected", "version": "153.6", "versionType": "rpm"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "159", "versionType": "rpm"}]}], "source": "security@mozilla.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Use-after-free in the DOM: HTML Parser component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6."}], "id": "CVE-2026-117920", "lastModified": "2026-10-27T19:17:17.677", "metrics": {}, "published": "2026-10-27T14:16:47.533", "references": [{"source": "security@mozilla.org", "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2079681"}, {"source": "security@mozilla.org", "url": "https://www.mozilla.org/security/advisories/mfsa2026-118/"}, {"source": "security@mozilla.org", "url": "https://www.mozilla.org/security/advisories/mfsa2026-120/"}, {"source": "security@mozilla.org", "url": "https://www.mozilla.org/security/advisories/mfsa2026-121/"}, {"source": "security@mozilla.org", "url": "https://www.mozilla.org/security/advisories/mfsa2026-122/"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Deferred"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[153.6,154.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[159,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Firefox", "source": "cna", "vendor": "Mozilla"}, "product": "firefox", "vendor": "mozilla"}], "created": "2026-10-27T18:15:06.711667+00:00", "updated": "2026-10-27T19:45:07.219540+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox"], "weaknesses": ["CWE-416"]}