Main Vulnerability Database Vulnerabilities #VU117352

Memory leak in MuPDF - CVE-2020-26683

Published: October 17, 2025

Vulnerability identifier: #VU117352

CSH Severity: Medium

CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-26683

CWE-ID: CWE-401

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform DoS attack on the target system.

The vulnerability exists due memory leak pdf_new_array() in /pdf/pdf-font-add.c. A remote attacker can force the application to leak memory and perform denial of service attack.

Affected software

MuPDF
Ubuntu
mupdf (Ubuntu package)

How to mitigate CVE-2020-26683

Install updates from vendor's website.

MuPDF - update to 1.18.0
mupdf (Ubuntu package) - addressed in versions 1.7a-1ubuntu0.1~esm1, 1.12.0+ds1-1ubuntu0.1~esm1, 1.16.1+ds1-1ubuntu1+esm1

External References

https://bugs.ghostscript.com/show_bug.cgi?id=702566
https://cgit.ghostscript.com/cgi-bin/cgit.cgi/mupdf.git/commit/?id=05720b4ee3dbae57e65546dc2eecc3021c08eeea

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