CVE-2026-100790: Vulnerability in Mozilla Firefox
Use-after-free in the XSLT component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
AI Analysis
Technical Summary
This vulnerability involves a use-after-free condition in the XSLT component of Mozilla Firefox, which could potentially allow attackers to execute arbitrary code or cause memory corruption. Mozilla has fixed this vulnerability in multiple Firefox ESR and standard releases, specifically in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17. The fix is part of a broader security update addressing multiple high-impact memory safety issues.
Potential Impact
The vulnerability is classified as high impact due to the use-after-free nature, which can lead to memory corruption and potentially arbitrary code execution. However, there are no known exploits in the wild currently. The issue affects the security and stability of Firefox browsers prior to the fixed versions.
Mitigation Recommendations
Users and administrators should update Firefox to at least Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, or Firefox ESR 140.17 to mitigate this vulnerability. Mozilla has officially fixed this issue in these releases. No additional mitigation is required beyond applying these updates.
CVE-2026-100790: Vulnerability in Mozilla Firefox
Description
Use-after-free in the XSLT component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
CVSS v3.1
Score 8.8high
Affected software
Mozilla
Firefox
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a use-after-free condition in the XSLT component of Mozilla Firefox, which could potentially allow attackers to execute arbitrary code or cause memory corruption. Mozilla has fixed this vulnerability in multiple Firefox ESR and standard releases, specifically in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17. The fix is part of a broader security update addressing multiple high-impact memory safety issues.
Potential Impact
The vulnerability is classified as high impact due to the use-after-free nature, which can lead to memory corruption and potentially arbitrary code execution. However, there are no known exploits in the wild currently. The issue affects the security and stability of Firefox browsers prior to the fixed versions.
Mitigation Recommendations
Users and administrators should update Firefox to at least Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, or Firefox ESR 140.17 to mitigate this vulnerability. Mozilla has officially fixed this issue in these releases. No additional mitigation is required beyond applying these updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-09-26T19:17:18.478Z
- 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/mfsa2026-98/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-99/","vendor":"Mozilla"}]
Threat ID: 6abbb3f1f7a7c5410664098e
Added to database: 09/29/2026, 12:49:53 UTC
Last enriched: 09/29/2026, 13:18:37 UTC
Last updated: 09/29/2026, 18:20:12 UTC
Views: 2
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