CVE-2026-92067: Vulnerability in Mozilla Firefox
Use-after-free in the Widget: Gtk component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, and Thunderbird 156.
AI Analysis
Technical Summary
This vulnerability involves a use-after-free condition in the Widget: Gtk component of Mozilla Firefox. Use-after-free vulnerabilities occur when a program continues to use memory after it has been freed, potentially leading to memory corruption and security issues. Mozilla fixed this vulnerability in Firefox 156 and Firefox ESR 153.3. The vendor advisory confirms the fix and classifies the impact as high.
Potential Impact
The vulnerability has a high impact rating according to Mozilla, indicating it could lead to serious security consequences such as memory corruption. However, there are no known active exploits in the wild currently. Successful exploitation could compromise the security of affected Firefox installations prior to version 156.
Mitigation Recommendations
Mozilla has released an official fix for this vulnerability in Firefox 156 and Firefox ESR 153.3. Users and administrators should update affected Firefox installations to version 156 or later to remediate this issue. No additional mitigation actions are indicated by the vendor advisory.
CVE-2026-92067: Vulnerability in Mozilla Firefox
Description
Use-after-free in the Widget: Gtk component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, and Thunderbird 156.
Affected software
Mozilla
Firefox
Mozilla
Thunderbird
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a use-after-free condition in the Widget: Gtk component of Mozilla Firefox. Use-after-free vulnerabilities occur when a program continues to use memory after it has been freed, potentially leading to memory corruption and security issues. Mozilla fixed this vulnerability in Firefox 156 and Firefox ESR 153.3. The vendor advisory confirms the fix and classifies the impact as high.
Potential Impact
The vulnerability has a high impact rating according to Mozilla, indicating it could lead to serious security consequences such as memory corruption. However, there are no known active exploits in the wild currently. Successful exploitation could compromise the security of affected Firefox installations prior to version 156.
Mitigation Recommendations
Mozilla has released an official fix for this vulnerability in Firefox 156 and Firefox ESR 153.3. Users and administrators should update affected Firefox installations to version 156 or later to remediate this issue. No additional mitigation actions are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-09-15T12:34:28.433Z
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-90/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-93/","vendor":"Mozilla"}]
Threat ID: 6aa93e6955bf5e2cf5d31028
Added to database: 09/15/2026, 12:47:37 UTC
Last enriched: 09/15/2026, 13:01:52 UTC
Last updated: 09/16/2026, 04:01:24 UTC
Views: 10
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.