There is an out-of-bounds read in fz_run_t3_glyph in fitz/font.c in Artifex MuPDF 1.14.0, as demonstrated by mutool.

published 2018-10-26 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-10378

cvss: 5.5; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.6%; EPSS 1.6% chance of exploitation in 30 days, percentile 76%
public exploits: 0; none known

Patch / fix

distros 2 links 1

debian opensuse

mupdf Debian 14, Debian 13, Debian 12 1.14.0+ds1-3

debian advisories DEBIAN-CVE-2018-18662

mupdf openSUSE Tumbleweed 1.18.0-1.7

opensuse advisories openSUSE-SU-2024:11068-1

cgit.ghostscript.com/cgi-bin/cgit.cgi/mupdf.git/commit/?id=164ddc22ee0d5b63a81d… commit

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-18662 updated 2025-11-21 cvss 4.4

mupdf: out-of-bounds read in fz_run_t3_glyph in fitz/font.c

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.61% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

bugs.ghostscript.com https://bugs.ghostscript.com/show_bug.cgi?id=700043 referenced PoC, tagged "exploit" by a source, unverified
github.com https://github.com/TeamSeri0us/pocs/tree/master/mupdf referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	5.5	CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness

CWE-125 Out-of-bounds Read

References

cgit.ghostscript.com /cgi-bin/cgit.cgi/mupdf.git/commit/?id=164ddc22ee0d5b63a81d5148f44c37dd132a9356
bugs.ghostscript.com /show_bug.cgi?id=700043
exploit, third-party-advisory
github.com /TeamSeri0us/pocs/tree/master/mupdf
exploit, third-party-advisory
securityfocus.com /bid/105755
vdb-entry, third-party-advisory
lists.debian.org /debian-lts-announce/2020/07/msg00019.html
mailing-list

Sources

CVE List CVE-2018-18662
NVD CVE-2018-18662

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary