{"id":"CVE-2025-8033","title":"The JavaScript engine did not handle closed generators correctly and it was possible to resume them leading to a nullptr deref","summary":"The JavaScript engine did not handle closed generators correctly and it was possible to resume them leading to a nullptr deref. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thund…","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-476"],"vendor":"mozilla","product":"firefox","affected":["firefox < 115.26.0","firefox < 141.0","firefox >= 128.0, < 128.13.0","firefox >= 140.0, < 140.1.0","thunderbird < 128.13.0","thunderbird < 141.0","thunderbird >= 140.0, < 140.1.0"],"patched":["firefox 140.1.0","thunderbird 140.1.0"],"published":"2025-07-22","updated":"2026-09-30","sourceUpdated":"2026-09-30T18:10:00.190","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-8033","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1973990","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-56/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-57/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-58/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-59/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-61/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-62/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-63/","label":"security@mozilla.org"},{"url":"https://lists.debian.org/debian-lts-announce/2025/07/msg00016.html","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00379,"epssPercentile":0.29387,"ingestedAt":"2026-09-30T18:17:24.448Z","slug":"CVE-2025-8033","body":"## Overview\n\nThe JavaScript engine did not handle closed generators correctly and it was possible to resume them leading to a nullptr deref. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.\n\n## Affected\n\n- `firefox < 115.26.0`\n- `firefox < 141.0`\n- `firefox >= 128.0, < 128.13.0`\n- `firefox >= 140.0, < 140.1.0`\n- `thunderbird < 128.13.0`\n- `thunderbird < 141.0`\n- `thunderbird >= 140.0, < 140.1.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `firefox 140.1.0`\n- `thunderbird 140.1.0`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}