CVE-2024-4774 Memory corruption in Firefox

What is CVE-2024-4774?

CVE-2024-4774 is a medium-severity memory corruption vulnerability in Mozilla Firefox, published on 14 May 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The `ShmemCharMapHashEntry()` code was susceptible to potentially undefined behavior by bypassing the move semantics for one of its data members. This vulnerability affects Firefox < 126.

Weakness: CWE-758

Which versions are affected by CVE-2024-4774?

It affects 1 product.

Products include Mozilla Firefox.

How do I fix CVE-2024-4774?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2024-4774 being exploited?

There is no known exploitation of CVE-2024-4774 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-36cp-x9pq-r87w, OESA-2025-1691, OESA-2025-1692, UBUNTU-CVE-2024-4774.