CVE-2026-92022: Vulnerability in Mozilla Firefox
Use-after-free in the DOM: HTML Parser component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 140.16.
AI Analysis
Technical Summary
CVE-2026-92022 is a use-after-free vulnerability affecting the DOM: HTML Parser component in Mozilla Firefox. This vulnerability allows for potential memory corruption issues due to improper handling of memory after it has been freed. Mozilla has fixed this issue in Firefox 156 and Firefox ESR versions 115.41, 140.16, and 153.3. The vendor advisory classifies the impact as high and provides multiple related advisories for various vulnerabilities fixed in the same release cycle. There is no CVSS score provided, and no known active exploitation has been reported.
Potential Impact
The vulnerability could lead to memory corruption, which may be leveraged to cause crashes or potentially execute arbitrary code. Mozilla rates the impact as high, indicating serious security implications if exploited. However, no active exploitation in the wild has been reported so far.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 156 and Firefox ESR versions 115.41, 140.16, and 153.3. Users and administrators should update to these versions or later to remediate the vulnerability. Patch status is confirmed by the vendor advisories. No additional mitigation steps are required beyond applying these updates.
CVE-2026-92022: Vulnerability in Mozilla Firefox
Description
Use-after-free in the DOM: HTML Parser component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 140.16.
Affected software
Mozilla
Firefox
Mozilla
Thunderbird
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-92022 is a use-after-free vulnerability affecting the DOM: HTML Parser component in Mozilla Firefox. This vulnerability allows for potential memory corruption issues due to improper handling of memory after it has been freed. Mozilla has fixed this issue in Firefox 156 and Firefox ESR versions 115.41, 140.16, and 153.3. The vendor advisory classifies the impact as high and provides multiple related advisories for various vulnerabilities fixed in the same release cycle. There is no CVSS score provided, and no known active exploitation has been reported.
Potential Impact
The vulnerability could lead to memory corruption, which may be leveraged to cause crashes or potentially execute arbitrary code. Mozilla rates the impact as high, indicating serious security implications if exploited. However, no active exploitation in the wild has been reported so far.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 156 and Firefox ESR versions 115.41, 140.16, and 153.3. Users and administrators should update to these versions or later to remediate the vulnerability. Patch status is confirmed by the vendor advisories. No additional mitigation steps are required beyond applying these updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-09-15T12:33:41.660Z
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-90/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-91/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-92/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-93/","vendor":"Mozilla"}]
Threat ID: 6aa93e6055bf5e2cf5d30fe0
Added to database: 09/15/2026, 12:47:28 UTC
Last enriched: 09/15/2026, 13:32:20 UTC
Last updated: 09/15/2026, 22:11:30 UTC
Views: 3
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.