CVE-2026-74961

CRITICAL 9.1CVE-2026-74961 · Published 18/08/2026 · updated 20/08/2026

In short

CVE-2026-74961 is a CRITICAL (CVSS 9.1) vulnerability affecting firefox (mozilla), thunderbird (mozilla).
Chance of exploitation in the next 30 days (EPSS): 0.44%, higher than 38.6% of all vulnerabilities.
Fix: update to 153.1.0 or later.

Package	Affected versions	Patched versions
firefox mozilla	`< 153.1.0`	`153.1.0`
thunderbird mozilla	`< 153.1.0`	`153.1.0`

Side-channel in the Web Audio component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

Running one of these products? Scan your site to see whether it exposes a vulnerable version.

Package

Affected versions

Patched versions

< 153.1.0

153.1.0

< 153.1.0

153.1.0

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