CVE-2026-7321

CRITICAL9.6

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

Published Apr 28, 2026

Modified 2 weeks ago

Details

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

WEB

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

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-7321

WEB

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

WEB

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

WEB

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

WEB

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

CVSS Analysis

CVSS v3.1

9.6

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

RequiredUI:R

Scope

ChangedS:C

Impact

Confidentiality

HighC:H

Integrity

HighI:H

Availability

HighA:H

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

Ecosystems

Timeline

PublishedApr 28, 2026

ModifiedApr 30, 2026