CVE-2026-74943
Undergoing Analysis Undergoing Analysis - In Progress

Use-after-Free in Firefox Graphics ImageLib Component

Publication date: 2026-08-18

Last updated on: 2026-08-18

Assigner: Mozilla Corporation

Description
Use-after-free in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1.

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Meta Information

Published
2026-08-18
Last Modified
2026-08-18
Generated
2026-08-18
AI Q&A
2026-08-18
EPSS Evaluated
N/A
NVD
CVE-2026-74943
EUVD
EUVD-2026-60750

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mozilla firefox to 154 (inc)
mozilla firefox_esr to 115.39 (inc)
mozilla firefox_esr to 140.14 (inc)
mozilla firefox_esr to 153.1 (inc)

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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 Graphics: ImageLib component. Use-after-free means the software tries to use memory after it has been freed, which can lead to crashes or arbitrary code execution. It was fixed in Firefox 154 and several Firefox ESR versions.

Detection Guidance

Detecting this vulnerability requires checking Firefox version. Run 'firefox --version' or check 'about:support' in Firefox. If version is below 154 (standard) or 115.39/140.14/153.1 (ESR), the system is vulnerable.

Impact Analysis

An attacker could exploit this to crash your browser or run malicious code on your system. This could allow them to steal data, install malware, or take control of your device if you visit a specially crafted webpage.

Compliance Impact

The provided CVE data does not specify how this vulnerability affects compliance with standards like GDPR or HIPAA. The description only mentions a use-after-free issue in Firefox's Graphics: ImageLib component, fixed in newer versions.

Mitigation Strategies

Update Firefox to version 154 or Firefox ESR to 115.39, 140.14, or 153.1 immediately. Disable automatic image processing in Firefox settings as a temporary workaround if updates are not immediately possible.

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