CVE-2026-100759

Analyzed Analyzed - Analysis Complete

Memory Corruption in Firefox Storage Quota Manager

Publication date: 2026-09-29

Last updated on: 2026-10-13

Assigner: Mozilla Corporation

Description

Uninitialized memory in the Storage: Quota Manager component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-29

Last Modified

2026-10-13

Generated

2026-10-19

AI Q&A

2026-09-29

EPSS Evaluated

2026-10-18

NVD

CVE-2026-100759

EUVD

EUVD-2026-88911

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	From 154.0.0 (inc) to 157.0.0 (exc)
mozilla	thunderbird	From 154.0 (inc) to 157.0 (exc)
mozilla	firefox	to 115.42.0 (exc)
mozilla	thunderbird	to 140.17.0 (exc)
mozilla	thunderbird	From 141.0 (inc) to 153.4.0 (exc)
mozilla	firefox	From 116.0.0 (inc) to 140.17.0 (exc)
mozilla	firefox	From 141.0.0 (inc) to 153.4.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-457	The code uses a variable that has not been initialized, leading to unpredictable or unintended results.

Attack-Flow Graph

Executive Summary

This vulnerability involves uninitialized memory in the Storage: Quota Manager component of Firefox. Uninitialized memory means memory that has not been cleared or set to a default value before use, which can lead to unintended data exposure or crashes.

Detection Guidance

This vulnerability is specific to Firefox browsers and relates to uninitialized memory in the Storage: Quota Manager component. Detection would require checking the installed Firefox version and comparing it against the fixed versions (Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, Firefox ESR 140.17). No direct network or system commands are provided in the context to detect this issue.

Impact Analysis

This vulnerability could allow attackers to read sensitive data from memory or cause unexpected behavior in the browser, such as crashes or incorrect data processing. Users of affected Firefox versions may be at risk of data leaks or system instability.

Compliance Impact

The provided CVE data does not specify how this vulnerability impacts compliance with standards like GDPR or HIPAA. The issue involves uninitialized memory in the Storage: Quota Manager component, which could potentially lead to data exposure or corruption. However, without additional context on data handling or storage mechanisms, the exact compliance implications cannot be determined.

Mitigation Strategies

Update Firefox ESR to version 153.4 or later, Firefox to version 157 or later, Firefox ESR 115.42 or later, or Firefox ESR 140.17 or later to address the uninitialized memory issue in the Storage: Quota Manager component.

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