{"id":"CVE-2026-100788","title":"Invalid pointer in the JavaScript: WebAssembly component","summary":"Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-824"],"vendor":"Mozilla","product":"Thunderbird","affected":["Thunderbird","Firefox"],"published":"2026-09-29","updated":"2026-10-01","sourceUpdated":"2026-10-01T15:17:18.727","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-100788","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2072413","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-100/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-101/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-102/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-103/","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"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-100788.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-100788"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2543174"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-100788"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-100788"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-102/#CVE-2026-100788"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-99/#CVE-2026-100788"},{"url":"https://access.redhat.com/errata/RHSA-2026:85240"},{"url":"https://access.redhat.com/errata/RHSA-2026:76764"},{"url":"https://access.redhat.com/errata/RHSA-2026:80674"},{"url":"https://access.redhat.com/errata/RHSA-2026:76850"},{"url":"https://access.redhat.com/errata/RHSA-2026:85243"},{"url":"https://access.redhat.com/errata/RHSA-2026:85242"},{"url":"https://access.redhat.com/errata/RHSA-2026:85241"},{"url":"https://access.redhat.com/errata/RHSA-2026:85244"},{"url":"https://access.redhat.com/errata/RHSA-2026:76761"},{"url":"https://access.redhat.com/errata/RHSA-2026:80694"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-01T14:45:12.848467Z"},"epss":0.00415,"epssPercentile":0.35567,"ingestedAt":"2026-09-29T13:34:31.665Z","scores":{"nvd":9.8,"vendor":7.5},"patched":["enterprise_linux_appstream_eus_v_10_0","enterprise_linux_appstream_v_10","enterprise_linux_appstream_v_8","enterprise_linux_appstream_aus_v_8_4","enterprise_linux_appstream_eus_extension_v_8_4","enterprise_linux_appstream_e4s_v_9_2","enterprise_linux_appstream_e4s_v_9_4","enterprise_linux_appstream_eus_v_9_6","enterprise_linux_appstream_v_9"],"slug":"CVE-2026-100788","body":"## Overview\n\nInvalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 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.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-100788.json)\n- **RHSA-2026:85240** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-10-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:85240)\n- **RHSA-2026:76764** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-10-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:76764)\n- **RHSA-2026:80674** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-10-12 · [advisory](https://access.redhat.com/errata/RHSA-2026:80674)\n- **RHSA-2026:76850** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-10-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:76850)\n- **RHSA-2026:85243** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) · released 2026-10-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:85243)\n- **RHSA-2026:85242** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-10-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:85242)\n- **RHSA-2026:85241** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-10-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:85241)\n- **RHSA-2026:85244** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6) · released 2026-10-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:85244)\n- **RHSA-2026:76761** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-10-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:76761)\n- **RHSA-2026:80694** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-10-12 · [advisory](https://access.redhat.com/errata/RHSA-2026:80694)","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":214350,"id":"CVE-2026-100788","ts":1790869746237,"field":"cvss","old":null,"new":"9.8"},{"seq":214349,"id":"CVE-2026-100788","ts":1790869746237,"field":"severity","old":"none","new":"critical"}]}