CVE-2026-109719
Received Received - Intake

CanvasWebGL Race Condition and Use-After-Free Vulnerability

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Mozilla Corporation

Description
Race condition, use-after-free in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

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Meta Information

Published
2026-10-13
Last Modified
2026-10-13
Generated
2026-10-19
AI Q&A
2026-10-13
EPSS Evaluated
2026-10-18
NVD
CVE-2026-109719
EUVD
EUVD-2026-98641

Affected Vendors & Products

Showing 6 associated CPEs
Vendor Product Version / Range
mozilla firefox to 158 (inc)
mozilla firefox to 115.43 (inc)
mozilla firefox to 153.5 (inc)
mozilla firefox 158
mozilla firefox_esr 115.43
mozilla firefox_esr 153.5

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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
CWE-362 The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

Attack-Flow Graph

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Executive Summary

This is a race condition and use-after-free vulnerability in Firefox's Graphics: CanvasWebGL component. A race condition occurs when two or more threads access shared data simultaneously, leading to unpredictable behavior. Use-after-free happens when a program continues to use memory after it has been freed, potentially causing crashes or arbitrary code execution.

Detection Guidance

This vulnerability is fixed in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5. To detect it, check your Firefox version using commands like 'firefox --version' or 'about:support' in Firefox. If your version is older than these, the system is vulnerable.

Impact Analysis

This vulnerability could allow attackers to execute arbitrary code, crash the browser, or gain unauthorized access to sensitive data. Users running vulnerable Firefox versions may experience system instability or security breaches if the flaw is exploited.

Compliance Impact

The provided CVE data does not specify direct impacts on compliance with GDPR, HIPAA, or other standards. The vulnerability involves a race condition and use-after-free in Graphics: CanvasWebGL, which could lead to memory corruption or crashes but lacks details on data exposure or privacy violations that would affect compliance.

Mitigation Strategies

Update Firefox to version 158 or later, Firefox ESR to version 115.43 or later, or Firefox ESR to version 153.5 or later to address the race condition and use-after-free issues in Graphics: CanvasWebGL.

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