PT-2026-6730 · Artifex · Mupdf

Pavel Kohout · Published 2026-01-01 · Updated 2026-02-23 · CVE-2026-25556

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions MuPDF versions 1.23.0 through 1.27.0

Description MuPDF versions 1.23.0 through 1.27.0 have a double-free issue in the fz fill pixmap from display list() function during display list rendering. This occurs when an exception happens, causing the function to incorrectly release a pixmap pointer in its error handling before re-throwing the exception. Subsequent cleanup by callers, including the barcode decoding path in fz decode barcode from display list(), also releases the same pixmap, leading to a double-free. This can corrupt the heap and cause the process to crash. The issue impacts applications using MuPDF barcode decoding and can be triggered by specially crafted input that causes a rendering error during barcode decoding.

Recommendations Update MuPDF to a version later than 1.27.0.

Exploit

Fix

DoS

Double Free

Weakness Enumeration

CWE-415

Related Identifiers

CVE-2026-25556

OPENSUSE-SU-2026:10214-1

Affected Products

Mupdf

References · 20

• 🔥 https://bugs.ghostscript.com/show_bug.cgi?id=709029 · Exploit
• https://cgit.ghostscript.com/cgi-bin/cgit.cgi/mupdf.git/commit/?id=d4743b6092d513321c23c6f7fe5cff87cde043c1 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-25556 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10214-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-25556 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-25556 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-25556 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-25556 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-25556 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-25556 · Security Note
• https://twitter.com/Cezar_H_Linux/status/2025907682025087220 · Twitter Post
• https://twitter.com/Cezar_H_Linux/status/2025555113947918510 · Twitter Post
• https://vulncheck.com/advisories/mupdf-barcode-decoding-double-free · Note
• https://twitter.com/Cezar_H_Linux/status/2025915595665863052 · Twitter Post
• https://suse.com/security/cve/CVE-2026-25556 · Note