CVE-2026-109765
Received Received - Intake

Race Condition and Use-After-Free in Firefox Graphics Text

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Mozilla Corporation

Description
Race condition, use-after-free in the Graphics: Text component. This vulnerability was fixed in Firefox 158, 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-2026-109765
EUVD
EUVD-2026-98525

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mozilla firefox to 158 (inc)
mozilla firefox_esr to 153.5 (inc)
mozilla firefox 158
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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 Text 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 a race condition and use-after-free issue in Firefox's Graphics: Text component. Detection requires checking Firefox version against patched releases (Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5). Use commands like 'firefox --version' or check package managers for version info.

Impact Analysis

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

Compliance Impact

The vulnerability's impact on compliance with standards like GDPR or HIPAA is not specified in the provided data. The issue involves a race condition and use-after-free in Firefox's Graphics: Text component, which could potentially lead to memory corruption or unauthorized access. However, without explicit details on data exposure or processing, its direct effect on regulatory compliance cannot be determined.

Mitigation Strategies

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

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