CVE-2026-7321: Vulnerability in Mozilla Firefox
Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox ESR 140.10.1.
AI Analysis
Technical Summary
CVE-2026-7321 is a vulnerability in Mozilla Firefox's WebRTC networking component where incorrect boundary conditions allow sandbox escape. This flaw compromises the isolation provided by the sandbox, potentially enabling an attacker to break out of restricted execution environments. The vulnerability was resolved in Firefox ESR 140.10.1 as part of a security update that addressed multiple memory safety and sandbox escape issues.
Potential Impact
The vulnerability allows sandbox escape, which can undermine the security model of Firefox by permitting code to execute outside the sandbox restrictions. This can lead to privilege escalation or unauthorized actions beyond the browser's intended security boundaries. Mozilla classifies the impact of this vulnerability as moderate, indicating a significant but not critical risk if exploited.
Mitigation Recommendations
Mozilla has released an official fix for this vulnerability in Firefox ESR 140.10.1. Users and administrators should update to this version or later to remediate the issue. No additional mitigation steps are required beyond applying the official update.
CVE-2026-7321: Vulnerability in Mozilla Firefox
Description
Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox ESR 140.10.1.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-7321 is a vulnerability in Mozilla Firefox's WebRTC networking component where incorrect boundary conditions allow sandbox escape. This flaw compromises the isolation provided by the sandbox, potentially enabling an attacker to break out of restricted execution environments. The vulnerability was resolved in Firefox ESR 140.10.1 as part of a security update that addressed multiple memory safety and sandbox escape issues.
Potential Impact
The vulnerability allows sandbox escape, which can undermine the security model of Firefox by permitting code to execute outside the sandbox restrictions. This can lead to privilege escalation or unauthorized actions beyond the browser's intended security boundaries. Mozilla classifies the impact of this vulnerability as moderate, indicating a significant but not critical risk if exploited.
Mitigation Recommendations
Mozilla has released an official fix for this vulnerability in Firefox ESR 140.10.1. Users and administrators should update to this version or later to remediate the issue. No additional mitigation steps are required beyond applying the official update.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-04-28T13:42:16.846Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-36/","vendor":"Mozilla"}]
Threat ID: 69f0c288cbff5d86101cc9ef
Added to database: 4/28/2026, 2:22:00 PM
Last enriched: 4/28/2026, 2:36:44 PM
Last updated: 4/28/2026, 3:42:57 PM
Views: 15
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