CVE-2026-100832
Received Received - Intake

Use-after-free in Firefox ESR Graphics: Canvas2D

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: Mozilla Corporation

Description
Use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox ESR 153.4, 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-2026-100832
EUVD
EUVD-2026-88810

Affected Vendors & Products

Showing 6 associated CPEs
Vendor Product Version / Range
mozilla firefox_esr 153.4
mozilla firefox_esr 115.42
mozilla firefox_esr 140.17
mozilla firefox to 153.4 (inc)
mozilla firefox to 115.42 (inc)
mozilla firefox to 140.17 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

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Executive Summary

This is a use-after-free vulnerability in Firefox's Graphics: Canvas2D 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. It was patched in Firefox ESR versions 153.4, 115.42, and 140.17.

Impact Analysis

An attacker could exploit this to execute arbitrary code on your system, potentially taking control of your device. It may also cause crashes or instability in the Firefox browser. Users running unpatched versions are at risk if malicious web content is accessed.

Mitigation Strategies

Update Firefox ESR to version 153.4, 115.42, or 140.17 or later to address the use-after-free vulnerability in the Graphics: Canvas2D component.

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