Denial-of-Service Vulnerability in Firefox by Mozilla
CVE-2026-100826

Currently unrated

Key Information:

Vendor: Mozilla
Status: Firefox
Vendor: CVE Published:; 29 September 2026

What is CVE-2026-100826?

This vulnerability resides in the StorageManager component of Firefox, which can lead to a denial-of-service attack. It affects versions of Firefox ESR and Firefox that have not been updated to the latest patched releases. Users are encouraged to upgrade to Firefox ESR 153.4 or Firefox 157 to mitigate this risk and benefit from enhanced security measures.

Affected Version(s)

Firefox 153.4

Firefox 157

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2059222

https://www.mozilla.org/security/advisories/mfsa2026-100/

https://www.mozilla.org/security/advisories/mfsa2026-97/

Download the Critical Vulnerability Management Cheat Sheet

Timeline

Vulnerability published
Sep 29, 2026
Vulnerability Reserved
Sep 26, 2026

Credit

Mozilla

CVE-2026-100826 Data

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