CVE-2025-0240

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 134 Firefox ESR versions prior to 128.6 Thunderbird versions prior to 134 Thunderbird versions prior to 128.6

Description Parsing a JavaScript module as JSON could, under some circumstances, cause cross-compartment access, which may result in a use-after-free.

Recommendations For Firefox versions prior to 134, update to version 134 or later. For Firefox ESR versions prior to 128.6, update to version 128.6 or later. For Thunderbird versions prior to 134, update to version 134 or later. For Thunderbird versions prior to 128.6, update to version 128.6 or later.