CVE-2025-3031: Mozilla Firefox

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

An attacker could read 32 bits of values spilled onto the stack in a JIT compiled function. This vulnerability was fixed in Firefox 137 and Thunderbird 137.

Affected products

• Mozilla Firefox: before 137.0 (fixed in 137.0)
• Mozilla Thunderbird: before 137.0 (fixed in 137.0)

Published 2025-04-01. Last modified 2026-09-30.