{"id":"CVE-2026-100769","title":"Use-after-free in the JavaScript: WebAssembly component","summary":"Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, and Firefox ESR 140.17.","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cwe":["CWE-416"],"vendor":"Mozilla","product":"Firefox","affected":["Firefox"],"published":"2026-09-29","updated":"2026-09-30","sourceUpdated":"2026-09-30T04:18:08.170","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-100769","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2067190","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-100/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-97/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-99/","label":"security@mozilla.org"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-29T14:40:44.034756Z"},"ingestedAt":"2026-09-29T13:34:31.657Z","slug":"CVE-2026-100769","body":"## Overview\n\nUse-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, and Firefox ESR 140.17.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":212825,"id":"CVE-2026-100769","ts":1790700052669,"field":"cvss","old":null,"new":"8.8"},{"seq":212824,"id":"CVE-2026-100769","ts":1790700052669,"field":"severity","old":"none","new":"high"}]}