Vulnerability · Published Jun 23, 2026 · Assigned by VulnCheck

CVE-2025-71382MuPDF < 1.27.0-rc1 Stack Exhaustion DoS via EPUB CSS Rendering

Medium 6.5

In plain English

A medium-severity security flaw in mupdf from ArtifexSoftware. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.6%top 51.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	mupdf	no fix listed	DEBIAN-CVE-2025-71382
Debian:13	mupdf	no fix listed	DEBIAN-CVE-2025-71382
Debian:14	mupdf	1.27.0+ds1-2	DEBIAN-CVE-2025-71382
Ubuntu:25.10	mupdf	no fix listed	UBUNTU-CVE-2025-71382
Ubuntu:26.04:LTS	mupdf	no fix listed	UBUNTU-CVE-2025-71382
Ubuntu:26.10	mupdf	no fix listed	UBUNTU-CVE-2025-71382

Affected products (as reported)

Vendor	Product	Versions
ArtifexSoftware	mupdf	0 – before 1.27.0-rc1

Weakness: CWE-674 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References

https://github.com/ArtifexSoftware/mupdf/releases/tag/1.27.0-rc1 release-notes
https://bugs.ghostscript.com/show_bug.cgi?id=708840 technical-description, exploit
https://github.com/ArtifexSoftware/mupdf/commit/70b71ab22e6de4d4c44cd301c88231f623a4e94e patch
https://www.vulncheck.com/advisories/mupdf-rc1-stack-exhaustion-dos-via-epub-css-rendering third-party-advisory