CVE-2026-8956

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 151 Firefox ESR versions prior to 140.11 Thunderbird versions prior to 151 Thunderbird versions prior to 140.11

Description An integer overflow exists in the Networking: JAR component. An integer overflow occurs when an arithmetic operation attempts to create a numeric value that is too large to be represented within the available storage area.

Recommendations Update Firefox to version 151. Update Firefox ESR to version 140.11. Update Thunderbird to version 151. Update Thunderbird to version 140.11.