Mozilla · Firefox · CVE-2026-2781
**Name of the Vulnerable Software and Affected Versions**
Firefox versions prior to 148
Firefox ESR versions prior to 140.8
Thunderbird versions prior to 148
Thunderbird versions prior to 140.8
**Description**
An integer overflow exists within the Libraries component of NSS. This issue may lead to unexpected behavior or potentially allow for malicious actions.
**Recommendations**
Update Firefox to version 148 or later.
Update Firefox ESR to version 140.8 or later.
Update Thunderbird to version 148 or later.
Update Thunderbird to version 140.8 or later.