{"id":"CVE-2026-100793","title":"JIT miscompilation in the JavaScript Engine component","summary":"JIT miscompilation in the JavaScript Engine component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","cwe":["CWE-843"],"vendor":"Mozilla","product":"Thunderbird","affected":["Thunderbird","Firefox"],"published":"2026-09-29","updated":"2026-10-01","sourceUpdated":"2026-10-01T15:17:19.063","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-100793","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2073268","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-101/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-97/","label":"security@mozilla.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-100793.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-100793"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2543126"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-100793"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-100793"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-97/#CVE-2026-100793"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-01T14:52:22.946812Z"},"epss":0.00269,"epssPercentile":0.18971,"ingestedAt":"2026-09-29T13:34:31.667Z","scores":{"nvd":6.5,"vendor":7.5},"slug":"CVE-2026-100793","body":"## Overview\n\nJIT miscompilation in the JavaScript Engine component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-100793.json)","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":214354,"id":"CVE-2026-100793","ts":1790869746820,"field":"cvss","old":null,"new":"6.5"},{"seq":214353,"id":"CVE-2026-100793","ts":1790869746820,"field":"severity","old":"none","new":"medium"}]}