CVE-2026-7321

critical · 9.6

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

CVSS

0.3%

EPSS (exploit prob.)

18th

EPSS percentile

2026-04-28

Published

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

Weaknesses

CWE-120

Affected products

Vendor	Product	Affected versions
mozilla	firefox	< 140.10.1
mozilla	firefox	< 150.0
mozilla	thunderbird	< 140.10.1
mozilla	thunderbird	< 150.0

Check a specific version with /api/v1/cve/match.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2029461
https://www.mozilla.org/security/advisories/mfsa2026-30/
https://www.mozilla.org/security/advisories/mfsa2026-33/
https://www.mozilla.org/security/advisories/mfsa2026-36/
https://www.mozilla.org/security/advisories/mfsa2026-39/

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-7321