CVE-2026-100759: Vulnerability in Mozilla Firefox
Uninitialized memory in the Storage: Quota Manager 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 concerns uninitialized memory usage within the Storage: Quota Manager component of Mozilla Firefox. Uninitialized memory vulnerabilities can lead to unpredictable behavior or information leakage. Mozilla fixed this issue in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17. The vendor advisory categorizes the impact as high and provides references to the bug report (Bug 2054736). There is no indication of active exploitation in the wild. The advisory is part of a broader set of security fixes released simultaneously.
Potential Impact
The vulnerability has a high impact rating as per Mozilla's advisory. Uninitialized memory issues can lead to potential information disclosure or other memory safety problems, which may compromise browser security. However, there are no confirmed reports of exploitation in the wild at this time.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17. Users and administrators should update affected Firefox installations to these versions or later to remediate the issue. No additional mitigation steps are indicated by the vendor advisory.
CVE-2026-100759: Vulnerability in Mozilla Firefox
Description
Uninitialized memory in the Storage: Quota Manager component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Affected software
Mozilla
Firefox
pkg:github/mozilla/firefoxRun 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 concerns uninitialized memory usage within the Storage: Quota Manager component of Mozilla Firefox. Uninitialized memory vulnerabilities can lead to unpredictable behavior or information leakage. Mozilla fixed this issue in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17. The vendor advisory categorizes the impact as high and provides references to the bug report (Bug 2054736). There is no indication of active exploitation in the wild. The advisory is part of a broader set of security fixes released simultaneously.
Potential Impact
The vulnerability has a high impact rating as per Mozilla's advisory. Uninitialized memory issues can lead to potential information disclosure or other memory safety problems, which may compromise browser security. However, there are no confirmed reports of exploitation in the wild at this time.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17. Users and administrators should update affected Firefox installations to these versions or later to remediate the issue. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-09-26T19:15:16.495Z
- 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: 6abbb3ebf7a7c5410664093d
Added to database: 09/29/2026, 12:49:47 UTC
Last enriched: 09/29/2026, 13:34:00 UTC
Last updated: 09/29/2026, 18:20:13 UTC
Views: 2
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