CVE-2026-100794: Vulnerability in Mozilla Firefox
Sandbox escape due to incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, and Firefox ESR 140.17.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-100794) in Mozilla Firefox is due to incorrect boundary conditions in the Internationalization component, which leads to a sandbox escape. The sandbox is a security mechanism designed to isolate processes and limit the impact of exploits. An escape from this sandbox could allow an attacker to execute code outside the restricted environment. Mozilla addressed this vulnerability by releasing fixes in Firefox ESR 153.4, Firefox 157, and Firefox ESR 140.17.
Potential Impact
The vulnerability enables sandbox escape, which can undermine Firefox's process isolation and security model. This could potentially allow an attacker to execute arbitrary code with higher privileges than intended, increasing the risk of system compromise. The impact is rated high by Mozilla.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox ESR 153.4, Firefox 157, and Firefox ESR 140.17. Users and administrators should update to these versions or later to remediate the issue. No additional mitigations are required as the vulnerability is fixed in these releases.
CVE-2026-100794: Vulnerability in Mozilla Firefox
Description
Sandbox escape due to incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, and Firefox ESR 140.17.
Affected software
Mozilla
Firefox
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-100794) in Mozilla Firefox is due to incorrect boundary conditions in the Internationalization component, which leads to a sandbox escape. The sandbox is a security mechanism designed to isolate processes and limit the impact of exploits. An escape from this sandbox could allow an attacker to execute code outside the restricted environment. Mozilla addressed this vulnerability by releasing fixes in Firefox ESR 153.4, Firefox 157, and Firefox ESR 140.17.
Potential Impact
The vulnerability enables sandbox escape, which can undermine Firefox's process isolation and security model. This could potentially allow an attacker to execute arbitrary code with higher privileges than intended, increasing the risk of system compromise. The impact is rated high by Mozilla.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox ESR 153.4, Firefox 157, and Firefox ESR 140.17. Users and administrators should update to these versions or later to remediate the issue. No additional mitigations are required as the vulnerability is fixed in these releases.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-09-26T19:17:28.521Z
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-100/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-97/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-99/","vendor":"Mozilla"}]
Threat ID: 6abbb3f1f7a7c54106640992
Added to database: 09/29/2026, 12:49:53 UTC
Last enriched: 09/29/2026, 13:18:23 UTC
Last updated: 09/29/2026, 18:20:13 UTC
Views: 6
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.