CVE-2026-4705

Undefined behavior in the WebRTC: Signaling component

Critical · published March 24, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
50.8
In the wild
Unconfirmed
What it is

Undefined behavior in the WebRTC: Signaling component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00656 · 50.8th percentile
Published
2026-03-24T12:30Z
EPSS history
Timeline
  • 24 MAR 12:30Z
    Undefined behavior in the WebRTC: Signaling component
    cvelistv5