CVE-2026-109742

4.3Medium

Published 13 Oct 2026 · NVD status: Deferred · AI triage by gemini-3.8-flash

4.3Medium

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required
Impact: Limited impact
Weakness: CWE-200

Impact

Remote attackers can access unauthorized information if a user views a malicious PDF. The attack requires user interaction to open or view the file.

Root cause

An information disclosure flaw exists within the PDF Viewer component.

Affected systems

Firefox prior to 158, Firefox ESR prior to 153.5, Thunderbird prior to 158, and Thunderbird ESR prior to 153.5.

CVSS v3.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Fix & remediation

Upgrade to Firefox 158, Firefox ESR 153.5, Thunderbird 158, or Thunderbird 153.5. No interim mitigation is specified.

shell

$ sudo apt-get update && sudo apt-get install --only-upgrade firefox thunderbird

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD 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.

References

Source: nvd.nist.gov/vuln/detail/CVE-2026-109742