CVE-2025-4087

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 138 Firefox ESR versions prior to 128.10 Thunderbird versions prior to 138 Thunderbird ESR versions prior to 128.10

Description A vulnerability was identified where XPath parsing could trigger undefined behavior due to missing null checks during attribute access. This could lead to out-of-bounds read access and potentially, memory corruption.

Recommendations For Firefox versions prior to 138, update to version 138 or later. For Firefox ESR versions prior to 128.10, update to version 128.10 or later. For Thunderbird versions prior to 138, update to version 138 or later. For Thunderbird ESR versions prior to 128.10, update to version 128.10 or later.