CVE-2025-3031 JIT optimization bug with different stack slot sizes

What is CVE-2025-3031?

CVE-2025-3031 is a medium-severity vulnerability in Mozilla Firefox, published on 1 Apr 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-200

Which versions are affected by CVE-2025-3031?

It affects 2 products.

Products include Mozilla Firefox, Mozilla Thunderbird.

How do I fix CVE-2025-3031?

Upgrade to a fixed version.

Is CVE-2025-3031 being exploited?

There is no known exploitation of CVE-2025-3031 in the wild and no public exploit code.

Other vulnerabilities in Mozilla Firefox

• CVE-2019-11708 Mozilla Firefox and Thunderbird Sandbox Escape Exploited Critical 10.0
• CVE-2010-3765 Mozilla Multiple Products Remote Code Execution Exploited Critical 9.8
• CVE-2022-26486 Mozilla Firefox Use-After-Free Exploited Critical 9.6
• CVE-2022-26485 Mozilla Firefox Use-After-Free Exploited High 8.8
• CVE-2019-11707 Mozilla Firefox and Thunderbird Type Confusion Exploited High 8.8

All Mozilla Firefox vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-5v8r-67h5-p4jj, UBUNTU-CVE-2025-3031.