CVE-2026-100832

Analyzed Analyzed - Analysis Complete

Use-after-free in Firefox ESR Graphics: Canvas2D

Publication date: 2026-09-29

Last updated on: 2026-10-05

Assigner: Mozilla Corporation

Description

Use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 140.17, Thunderbird 153.4, 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

2026-10-05

Generated

2026-10-19

AI Q&A

2026-09-29

EPSS Evaluated

2026-10-18

NVD

CVE-2026-100832

EUVD

EUVD-2026-88810

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 115.42.0 (exc)
mozilla	firefox	From 116.0 (inc) to 140.17.0 (exc)
mozilla	firefox	From 141.0 (inc) to 153.4.0 (exc)
mozilla	thunderbird	to 140.17.0 (exc)
mozilla	thunderbird	From 141.0 (inc) to 153.4.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

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.

Detection Guidance

This vulnerability is specific to Firefox ESR versions before 153.4, 115.42, and 140.17. Detection involves checking installed Firefox ESR versions. Use commands like 'firefox --version' or 'apt list --installed | grep firefox-esr' on Linux to verify versions. If outdated, update immediately.

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.

Compliance Impact

The provided CVE data does not specify direct impacts on compliance with standards like GDPR or HIPAA. The vulnerability involves a use-after-free in the Graphics: Canvas2D component, which could potentially lead to arbitrary code execution or data corruption. Such issues may indirectly affect compliance by compromising data integrity or confidentiality, but no explicit details are provided.

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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