CVE-2026-92027: Vulnerability in Mozilla Firefox
Use-after-free in the DOM: Streams 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-2026-92027 is a use-after-free vulnerability affecting the DOM: Streams component in Mozilla Firefox. This type of vulnerability can lead to memory corruption issues. Mozilla has fixed this vulnerability in Firefox 156 and Firefox ESR versions 115.41, 140.16, and 153.3. The vendor advisory categorizes the impact as high and provides detailed references to the bug report. No active exploitation has been reported.
Potential Impact
The vulnerability allows potential memory corruption due to use-after-free in the DOM: Streams component, which could be leveraged to compromise the security of the Firefox browser. The impact is rated high by Mozilla, indicating serious security implications if exploited. However, there are no known exploits in the wild at this time.
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 issue. Since the vulnerability is fixed, no additional mitigation steps are required beyond applying the official patches.
CVE-2026-92027: Vulnerability in Mozilla Firefox
Description
Use-after-free in the DOM: Streams 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
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
CVE-2026-92027 is a use-after-free vulnerability affecting the DOM: Streams component in Mozilla Firefox. This type of vulnerability can lead to memory corruption issues. Mozilla has fixed this vulnerability in Firefox 156 and Firefox ESR versions 115.41, 140.16, and 153.3. The vendor advisory categorizes the impact as high and provides detailed references to the bug report. No active exploitation has been reported.
Potential Impact
The vulnerability allows potential memory corruption due to use-after-free in the DOM: Streams component, which could be leveraged to compromise the security of the Firefox browser. The impact is rated high by Mozilla, indicating serious security implications if exploited. However, there are no known exploits in the wild at this time.
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 issue. Since the vulnerability is fixed, no additional mitigation steps are required beyond applying the official patches.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-09-15T12:33:47.325Z
- 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: 6aa93e6255bf5e2cf5d30fe6
Added to database: 09/15/2026, 12:47:30 UTC
Last enriched: 09/15/2026, 13:31:55 UTC
Last updated: 09/16/2026, 04:01:24 UTC
Views: 8
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.