CVE-2026-109705
Deferred Deferred - Pending Action

Firefox Networking Component Use-After-Free Vulnerability

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Mozilla Corporation

Description
Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5.

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Meta Information

Published
2026-10-13
Last Modified
2026-10-13
Generated
2026-10-13
AI Q&A
2026-10-13
EPSS Evaluated
N/A
NVD
CVE-2026-109705
EUVD
EUVD-2026-98483

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

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Executive Summary

This is a sandbox escape vulnerability in Firefox caused by incorrect boundary conditions and a use-after-free issue in the Networking component. It allows malicious code to break out of the browser's security sandbox, potentially accessing system resources or other browser data.

Impact Analysis

If exploited, this vulnerability could allow an attacker to run arbitrary code on your system, steal sensitive data, or perform actions outside the browser's security restrictions. Users of affected Firefox versions are at risk until they update to Firefox 158 or Firefox ESR 153.5.

Mitigation Strategies

Update Firefox to version 158 or later and Firefox ESR to version 153.5 or later to patch the vulnerability.

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