CVE-2025-1009: firefox: thunderbird: Use-after-free in XSLT

Severity: Critical

CVSS Score: 9.8

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.