CVE-2025-1009
criticalAn attacker could have caused a use-after-free via crafted XSLT data, leading to a potentially exploitable crash.
Vendor / product: Mozilla — firefox
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.
CVSS
9.8
9.8 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2025-02-04 14:15
Modified: 2026-10-05 15:10
NVD status: Modified
Last synced 2 days ago
Verified against the source API 2026-10-27 07:06 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
mozilla / firefox <115.20.0, <135.0, ≥128.1.0 <128.7.0
mozilla / thunderbird ≥128.0.1 <128.7.0, ≥131.0 <135.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2025-07/
Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2025-08/
Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2025-09/
Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2025-10/
Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2025-11/
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1936613 security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2025-07/ security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2025-08/ security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2025-09/ security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2025-10/ security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2025-11/ security@mozilla.org
- https://lists.debian.org/debian-lts-announce/2025/02/msg00005.html af854a3a-2127-422b-91ae-364da2661108
- https://lists.debian.org/debian-lts-announce/2025/02/msg00006.html af854a3a-2127-422b-91ae-364da2661108
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 07:06 UTC · record ↗