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Vulnerability record · CVE-2021-37220 · published 21 July 2021

CVE-2021-37220: Artifex mupdf out-of-bounds write vulnerability

Artifex · Mupdf

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.

5.5 CVSS 3.1 Medium EPSS 1.3% · top 29.7% CWE-787 · Out-of-bounds write
5.5CVSS 3.1 base score, v2 4.3
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://git.ghostscript.com/?p=mupdf.git%3Bh=f5712c9949d026e4b891b25837edd2edc166151f
https://bugs.ghostscript.com/show_bug.cgi?id=703791 ExploitVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TKRMREIYUBGG2GV73CU7BJN
http://git.ghostscript.com/?p=mupdf.git%3Bh=f5712c9949d026e4b891b25837edd2edc166151f
https://bugs.ghostscript.com/show_bug.cgi?id=703791 ExploitVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TKRMREIYUBGG2GV73CU7BJN

Track CVE-2021-37220 inside VULONE

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-37220), CISA KEV, FIRST EPSS (scores of 2026-10-12). This page is refreshed as NVD updates the record.