CVE-2021-37220: Artifex Mupdf

Medium severity, CVSS 5.5. EPSS: 1.3% chance of exploitation in the next 30 days.

MuPDF through 1.18.1 has an out-of-bounds write because the cached color converter does not properly consider the maximum key size of a hash table. This can, for example, be seen with crafted "mutool draw" input.

Affected products

• Artifex Mupdf: up to and including 1.18.1
• Fedoraproject Fedora: version 34 only

Published 2021-07-21. Last modified 2026-06-17.