CVE-2024-4367: Debian Linux

High severity, CVSS 8.8. EPSS: 70.7% chance of exploitation in the next 30 days.

A type check was missing when handling fonts in PDF.js, which would allow arbitrary JavaScript execution in the PDF.js context. This vulnerability affects Firefox < 126, Firefox ESR < 115.11, and Thunderbird < 115.11.

Affected products

• Debian Debian Linux: version 10.0 only
• Mozilla Firefox: before 115.11.0 (fixed in 115.11.0); before 126.0 (fixed in 126.0)
• Mozilla Thunderbird: before 115.11.0 (fixed in 115.11.0)
• Open-Xchange Open-Xchange Appsuite Frontend: before 7.10.6 (fixed in 7.10.6); version 7.10.6 only

Published 2024-05-14. Last modified 2026-06-17.