MuPDF < 1.27.0-rc1 Stack Exhaustion DoS via EPUB CSS Rendering

7.1 CVSS

Vulnerability Description

MuPDF before 1.27.0-rc1 contains an uncontrolled recursion vulnerability in the EPUB CSS rendering engine that allows remote attackers to cause a denial of service by supplying a maliciously crafted EPUB file with deeply nested HTML elements and inline CSS styles. The function value_from_inheritable_property() in css-apply.c recurses through the CSS property inheritance chain without a depth limit, exhausting the process stack and causing a crash in any application using MuPDF for EPUB rendering.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

Ishayu Potey

References

Affected Vendor

ArtifexSoftware

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Affected Software

mupdf

Vulnerable Versions:

Timeline

Official Publish: June 23rd, 2026

Last Modified: July 14th, 2026

Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Weaknesses (CWE)

CWE-674

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.