CVE-2026-113401
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Denial-of-Service in Firefox PDF Viewer

Publication date: 2026-10-20

Last updated on: 2026-10-20

Assigner: Mozilla Corporation

Description
Denial-of-service in the PDF Viewer component. This vulnerability was fixed in Firefox 158.0.1 and Thunderbird 158.0.1.

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Meta Information

Published
2026-10-20
Last Modified
2026-10-20
Generated
2026-11-09
AI Q&A
2026-10-20
EPSS Evaluated
2026-11-08
NVD
CVE-2026-113401
EUVD
EUVD-2026-104982

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
mozilla firefox 158.0.1

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.

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Executive Summary

This is a denial-of-service vulnerability in Firefox's PDF Viewer component. It allows an attacker to crash the application by exploiting a flaw in how it processes certain PDF files.

Detection Guidance

To detect this vulnerability, check if your Firefox or Thunderbird version is below 158.0.1. Run 'firefox --version' or 'thunderbird --version' to verify. If outdated, update immediately to patch the DoS vulnerability in the PDF Viewer component.

Impact Analysis

If exploited, this vulnerability could cause Firefox to crash when viewing a malicious PDF file, leading to loss of access to the browser and any open tabs until restarted.

Compliance Impact

This vulnerability is a denial-of-service issue in the PDF Viewer component of Firefox. It does not directly affect compliance with GDPR or HIPAA as it does not involve unauthorized data access or disclosure. However, a denial-of-service condition could impact availability of services, which may indirectly affect compliance if systems become unavailable for extended periods.

Mitigation Strategies

Update Firefox to version 158.0.1 or later to address the denial-of-service vulnerability in the PDF Viewer component.

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