{"id":"CVE-2026-92027","title":"Use-after-free in the DOM: Streams component","summary":"Use-after-free in the DOM: Streams component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.","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","CWE-825"],"vendor":"Mozilla","product":"Firefox","affected":["Firefox","Thunderbird"],"published":"2026-09-15","updated":"2026-09-18","sourceUpdated":"2026-09-18T14:19:04.027","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-92027","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2068433","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-90/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-91/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-92/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-93/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-94/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-95/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-96/","label":"security@mozilla.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92027.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-92027"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2533757"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-92027"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92027"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-92/#CVE-2026-92027"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-95/#CVE-2026-92027"},{"url":"https://access.redhat.com/errata/RHSA-2026:69461"},{"url":"https://access.redhat.com/errata/RHSA-2026:69462"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-18T13:42:20.082670Z"},"epss":0.0034,"epssPercentile":0.27518,"scores":{"nvd":8.8,"vendor":7.5},"ingestedAt":"2026-09-15T12:36:50.191Z","patched":["enterprise_linux_appstream_v_10","enterprise_linux_appstream_v_9"],"slug":"CVE-2026-92027","body":"## Overview\n\nUse-after-free in the DOM: Streams component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.\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, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, … · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92027.json)\n- **RHSA-2026:69461** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69461)\n- **RHSA-2026:69462** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69462)","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":206852,"id":"CVE-2026-92027","ts":1789742631007,"field":"cvss","old":"7.5","new":"8.8"},{"seq":206392,"id":"CVE-2026-92027","ts":1789663224351,"field":"cvss","old":null,"new":"7.5"},{"seq":206391,"id":"CVE-2026-92027","ts":1789663224351,"field":"severity","old":"none","new":"high"}]}