CVE-2026-6758

HIGH 7.5CVE-2026-6758 · Published 21/04/2026 · updated 26/10/2026

In short

CVE-2026-6758 is a HIGH (CVSS 7.5) vulnerability affecting firefox (mozilla), thunderbird (mozilla).
Chance of exploitation in the next 30 days (EPSS): 0.81%, higher than 56.9% of all vulnerabilities.
Fix: update to 150.0 or later.

Package	Affected versions	Patched versions
firefox mozilla	`< 150.0`	`150.0`
thunderbird mozilla	`< 150.0`	`150.0`

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

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

Package

Affected versions

Patched versions

< 150.0

150.0

< 150.0

150.0

More vulnerabilities in firefox

See all →