CVE-2026-109708

Deferred Deferred - Pending Action

Firefox Networking Component Boundary Condition Sandbox Escape

Publication date: 2026-10-13

Last updated on: 2026-10-15

Assigner: Mozilla Corporation

Description

Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-15

Generated

2026-10-19

AI Q&A

2026-10-13

EPSS Evaluated

2026-10-18

NVD

CVE-2026-109708

EUVD

EUVD-2026-98485

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 158 (inc)
mozilla	firefox_esr	to 153.5 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-119	The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Attack-Flow Graph

Executive Summary

This vulnerability allows an attacker to escape the sandbox environment due to incorrect boundary conditions in the Networking component of Firefox. This means malicious code could potentially run outside the restricted sandbox, gaining unauthorized access to the host system.

Impact Analysis

If exploited, this vulnerability could allow an attacker to execute arbitrary code on your system, leading to data theft, system compromise, or installation of malware. Users of affected Firefox versions are at risk until they update to the patched versions.

Compliance Impact

This vulnerability does not provide specific details about compliance impacts on standards like GDPR or HIPAA. The issue involves a sandbox escape in the Networking component, which could potentially lead to unauthorized access or data breaches, but no direct information is provided about regulatory compliance implications.

Mitigation Strategies

Update Firefox to version 158 or later and Firefox ESR to version 153.5 or later to address the sandbox escape vulnerability.

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