CVE-2026-16406

Mitigation bypass in the Networking component

Critical · published July 21, 2026

CVSS v3.1
9.1
EPSS
0%
Percentile
15.5
In the wild
Unconfirmed
What it is

Mitigation bypass in the Networking component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00251 · 15.5th percentile
Published
2026-07-21T12:38Z
EPSS history
Timeline
  • 21 JUL 12:38Z
    Mitigation bypass in the Networking component
    cvelistv5