Artifex MuPDF up to 1.27.0 fz_fill_pixmap_from_display_list double free

Summaryinfo

A vulnerability, which was classified as problematic, was found in Artifex MuPDF up to 1.27.0. Affected by this vulnerability is the function fz_fill_pixmap_from_display_list. Such manipulation leads to double free. This vulnerability is documented as CVE-2026-25556. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Artifex MuPDF up to 1.27.0 and classified as problematic. Affected by this issue is the function fz_fill_pixmap_from_display_list. The manipulation with an unknown input leads to a double free vulnerability. Using CWE to declare the problem leads to CWE-415. The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. Impacted is availability. CVE summarizes:

MuPDF versions 1.23.0 through 1.27.0 contain a double-free vulnerability in fz_fill_pixmap_from_display_list() when an exception occurs during display list rendering. The function accepts a caller-owned fz_pixmap pointer but incorrectly drops the pixmap in its error handling path before rethrowing the exception. Callers (including the barcode decoding path in fz_decode_barcode_from_display_list) also drop the same pixmap in cleanup, resulting in a double-free that can corrupt the heap and crash the process. This issue affects applications that enable and use MuPDF barcode decoding and can be triggered by processing crafted input that causes a rendering-time error while decoding barcodes.

The advisory is shared for download at bugs.ghostscript.com. This vulnerability is handled as CVE-2026-25556 since 02/02/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 02/26/2026).

The vulnerability scanner Nessus provides a plugin with the ID 298282 (Linux Distros Unpatched Vulnerability : CVE-2026-25556), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (298282) and EUVD (EUVD-2026-6091). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Document Reader Software

Vendor

• Artifex

Name

• MuPDF

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25
• 1.26
• 1.27.0

License

• commercial

Website

• Vendor: https://artifex.com/

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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