by Kastro
Paper/Archive/CVE-2026-7321

CVE-2026-7321

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

EPSS 0.3%CVSS 9.6
critical.is priorityof 100
32
CVSS 9.6 (ADP)9.6 / 10 × 3028.8Not in CISA KEV+300.0EPSS percentile 17.5.175 × 203.5No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Firefoxsee advisory140.10.1CNA
Thunderbirdsee advisory140.10.1CNA

Scores by source

CISA ADP9.6CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refbugzilla.mozilla.org/show_bug.cgi?id=2029461refmozilla.org/security/advisories/mfsa2026-30refmozilla.org/security/advisories/mfsa2026-33refmozilla.org/security/advisories/mfsa2026-36refmozilla.org/security/advisories/mfsa2026-39