CVE-2026-7321

critical

Description

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.

References

https://www.mozilla.org/security/advisories/mfsa2026-39/

https://www.mozilla.org/security/advisories/mfsa2026-36/

https://www.mozilla.org/security/advisories/mfsa2026-33/

https://www.mozilla.org/security/advisories/mfsa2026-30/

https://bugzilla.mozilla.org/show_bug.cgi?id=2029461

Details

Source: Mitre, NVD

Published: 2026-04-28

Updated: 2026-05-01

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.6

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H