CVE-2024-4771

Severity: high (CVSS 8.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-05-14 · updated 2026-06-17
Weakness: CWE-416

Description

A memory allocation check was missing which would lead to a use-after-free if the allocation failed. This could have triggered a crash or potentially be leveraged to achieve code execution. This vulnerability affects Firefox < 126.

Affected products

Mozilla Firefox: before 126.0 — fixed in 126.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 126.0. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1893891
https://www.mozilla.org/security/advisories/mfsa2024-21/
https://bugzilla.mozilla.org/show_bug.cgi?id=1893891
https://www.mozilla.org/security/advisories/mfsa2024-21/

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