CVE-2026-100773
Received Received - Intake

Use-after-free in Firefox Storage IndexedDB

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: Mozilla Corporation

Description
Use-after-free in the Storage: IndexedDB component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

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Meta Information

Published
2026-09-29
Last Modified
2026-09-29
Generated
2026-09-29
AI Q&A
2026-09-29
EPSS Evaluated
N/A
NVD
CVE-2026-100773
EUVD
EUVD-2026-88925

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mozilla firefox to 153.4 (inc)
mozilla firefox 157
mozilla firefox to 115.42 (inc)
mozilla firefox 140.17

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a use-after-free vulnerability in Firefox's Storage: IndexedDB component. Use-after-free occurs when a program continues to use memory after it has been freed, potentially leading to crashes or arbitrary code execution. The issue was addressed in specific Firefox versions including ESR 153.4, Firefox 157, ESR 115.42, and ESR 140.17.

Detection Guidance

Detecting this vulnerability requires checking Firefox version against patched releases. Compare your installed version with Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, or Firefox ESR 140.17. Use commands like 'firefox --version' or check 'about:support' in Firefox.

Impact Analysis

This vulnerability could allow an attacker to execute arbitrary code on your system by exploiting the use-after-free flaw in Firefox's IndexedDB storage. This might lead to system crashes, data corruption, or unauthorized access to sensitive information if the attacker gains control of your browser session.

Mitigation Strategies

Update Firefox to the latest patched version immediately. If using ESR, upgrade to Firefox ESR 153.4, 115.42, or 140.17. Disable IndexedDB if not required or restrict access to untrusted websites.

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