What is CVE-2023-31794?

CVE-2023-31794 is a medium-severity vulnerability in Artifex Mupdf, classified under Uncontrolled Recursion. CVSS score: 5.5/10. Published 2023-10-31.

How severe is CVE-2023-31794?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Artifex Mupdf

CVE-2023-31794

MuPDF v1.21.1 was discovered to contain an infinite recursion in the component pdf_mark_list_push. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted PDF file.

Published 2023-10-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (12.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 12.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Artifex Mupdf — versions 1.21.1

Weakness classification (CWE)

CWE-674 — Uncontrolled Recursion

References

bugs.ghostscript.com/show_bug.cgi (Permissions Required)
git.ghostscript.com/ (Broken Link)
gist.github.com/spookhorror/c770d118767b1b0d89fdfe2845169d06 (Third Party Advisory)

Frequently asked questions

What is CVE-2023-31794?: CVE-2023-31794 is a medium-severity vulnerability in Artifex Mupdf, classified under Uncontrolled Recursion. CVSS score: 5.5/10. Published 2023-10-31.
How severe is CVE-2023-31794?: Medium severity. CVSS v3 base score is 5.5 out of 10.