CVE-2026-109742
Received Received - Intake

Information Disclosure in Firefox PDF Viewer

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Mozilla Corporation

Description
Information disclosure in the PDF Viewer component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

CVSS Scores

EPSS Scores

Probability:
Percentile:

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-2026-109742
EUVD
EUVD-2026-98504

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox to 158 (inc)
mozilla firefox_esr to 153.5 (inc)

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-200 The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability is an information disclosure issue in the PDF Viewer component of Firefox. It was addressed in Firefox version 158 and Firefox ESR version 153.5.

Detection Guidance

This vulnerability is specific to Firefox versions before 158 and Firefox ESR before 153.5. To detect it, check your installed Firefox version using commands like 'firefox --version' or 'apt show firefox' on Debian-based systems. If the version is below the fixed release, the system is vulnerable.

Impact Analysis

An attacker could exploit this flaw to access sensitive information through the PDF Viewer component. Users running vulnerable versions of Firefox may have their data exposed.

Compliance Impact

The vulnerability is an information disclosure issue in Firefox's PDF Viewer component. While it does not directly impact GDPR or HIPAA compliance, such vulnerabilities could potentially lead to unauthorized data exposure if exploited, which may violate privacy requirements under these regulations. However, no specific compliance impact is mentioned in the provided CVE details.

Mitigation Strategies

Update Firefox to version 158 or later and Firefox ESR to version 153.5 or later to address the information disclosure vulnerability in the PDF Viewer component.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-109742. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart