{"id":"CVE-2025-1009","title":"An attacker could have caused a use-after-free via crafted XSLT data, leading to a potentially exploitable crash","summary":"An attacker could have caused a use-after-free via crafted XSLT data, leading to a potentially exploitable crash. This vulnerability was fixed in Firefox 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.","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-416","CWE-416"],"vendor":"mozilla","product":"firefox","affected":["firefox < 115.20.0","firefox < 135.0","firefox >= 128.1.0, < 128.7.0","thunderbird >= 128.0.1, < 128.7.0","thunderbird >= 131.0, < 135.0"],"patched":["firefox 128.7.0","thunderbird 135.0"],"published":"2025-02-04","updated":"2026-09-30","sourceUpdated":"2026-09-30T18:10:00.190","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-1009","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1936613","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-07/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-08/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-09/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-10/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-11/","label":"security@mozilla.org"},{"url":"https://lists.debian.org/debian-lts-announce/2025/02/msg00005.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2025/02/msg00006.html","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.01207,"epssPercentile":0.67184,"ingestedAt":"2026-09-30T18:17:24.427Z","slug":"CVE-2025-1009","body":"## Overview\n\nAn attacker could have caused a use-after-free via crafted XSLT data, leading to a potentially exploitable crash. This vulnerability was fixed in Firefox 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.\n\n## Affected\n\n- `firefox < 115.20.0`\n- `firefox < 135.0`\n- `firefox >= 128.1.0, < 128.7.0`\n- `thunderbird >= 128.0.1, < 128.7.0`\n- `thunderbird >= 131.0, < 135.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `firefox 128.7.0`\n- `thunderbird 135.0`","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}