CVE-2026-7321

Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component

Critical · published April 28, 2026

CVSS v3.1
9.6
EPSS
0%
Percentile
38.0
In the wild
Unconfirmed
What it is

Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, and Thunderbird 140.10.1.

The record
Technical detail
CVSS v3.1
9.6 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00449 · 38.0th percentile
Published
2026-04-28T13:49Z
EPSS history
Timeline
  • 28 APR 13:49Z
    Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component
    cvelistv5