Memory Corruption Vulnerability in Firefox by Mozilla
CVE-2026-74989

Currently unrated

Key Information:

Vendor: Mozilla
Status: Firefox
Vendor: CVE Published:; 18 August 2026

What is CVE-2026-74989?

The vulnerability in Firefox 153 pertains to multiple internally identified bugs that indicate potential memory corruption and other security-relevant defects. While these flaws were fixed in Firefox 154, they presented a risk of being exploited by malicious entities with sufficient skill and determination. Users are advised to upgrade to the latest version to mitigate any risks associated with these vulnerabilities.

Affected Version(s)

Firefox 154

References

https://bugzilla.mozilla.org/buglist.cgi?bug_id=2022257%2...

https://bugzilla.mozilla.org/buglist.cgi?bug_id=2027388%2...

https://www.mozilla.org/security/advisories/mfsa2026-74/

Download the Critical Vulnerability Management Cheat Sheet

Timeline

Vulnerability published
Aug 18, 2026
Vulnerability Reserved
Aug 17, 2026

Credit

Christian Holler, Ryan Hunt, Tom Ritter and the Mozilla Fuzzing Team

CVE-2026-74989 Data

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