CVE-2026-6758

Use-after-free in the JavaScript: WebAssembly component

High · published April 21, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
42.1
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00502 · 42.1th percentile
Published
2026-04-21T12:40Z
EPSS history
Timeline
  • 21 APR 12:40Z
    Use-after-free in the JavaScript: WebAssembly component
    cvelistv5