CVE-2026-7321

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-7321
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.

9.6 /10

CVSS v3 : CRITICAL

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 6.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References
Link Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=2029461 Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-30/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-33/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-36/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-39/ Vendor Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*
History

01 May 2026, 17:54

Type Values Removed Values Added
CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
First Time Mozilla
Mozilla firefox
Mozilla thunderbird
References () https://bugzilla.mozilla.org/show_bug.cgi?id=2029461 - () https://bugzilla.mozilla.org/show_bug.cgi?id=2029461 - Permissions Required
References () https://www.mozilla.org/security/advisories/mfsa2026-30/ - () https://www.mozilla.org/security/advisories/mfsa2026-30/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-33/ - () https://www.mozilla.org/security/advisories/mfsa2026-33/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-36/ - () https://www.mozilla.org/security/advisories/mfsa2026-36/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-39/ - () https://www.mozilla.org/security/advisories/mfsa2026-39/ - Vendor Advisory

30 Apr 2026, 18:16

Type Values Removed Values Added
References
  • () https://www.mozilla.org/security/advisories/mfsa2026-39/ -
Summary (en) Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox 150, Thunderbird 150, and Firefox ESR 140.10.1. (en) 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.

29 Apr 2026, 06:16

Type Values Removed Values Added
Summary (en) Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox ESR 140.10.1. (en) Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox 150, Thunderbird 150, and Firefox ESR 140.10.1.
References
  • () https://www.mozilla.org/security/advisories/mfsa2026-30/ -
  • () https://www.mozilla.org/security/advisories/mfsa2026-33/ -

28 Apr 2026, 15:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-04-28 15:16

Updated : 2026-05-01 17:54

NVD link : CVE-2026-7321

Mitre link : CVE-2026-7321

CVE.ORG link : CVE-2026-7321

JSON object : View

Products Affected

mozilla

  • firefox
  • thunderbird
CWE
CWE-120

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')