CVE-2025-71382: MuPDF before 1.27.0-rc1 contains an uncontrolled recursion vulnerability in the EPUB CSS rendering engine that

Q: How do I fix CVE-2025-71382?

mupdf: upgrade to 1.27.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-71382 being exploited?

CVE-2025-71382 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-71382 affect?

CVE-2025-71382 affects mupdf. Severity is medium (CVSS 6.5). 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 element

Q: How urgent is CVE-2025-71382?

Priority 40/100. Public exploit reference

This month

MEDIUM 6.5UPGRADE

CVE-2025-71382 is a medium-severity flaw (CVSS 6.5) affecting mupdf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-674
Published	2026-06-23
Last modified	2026-10-06

Publisher (CNA): VulnCheck · Vendor: artifex

Last updated 2026-10-06 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-23 18:17 UTCPublished CVE record published
2026-10-06 22:10 UTCUpdated Record last modified

artifex mupdf UPGRADE

Affected: < 1.27.0

Fixed in: 1.27.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mupdf || rpm -q mupdf || mupdf --version

2. UPGRADE to 1.27.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mupdf

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mupdf

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-71382?

mupdf: upgrade to 1.27.0. Exact commands for each OS are on this page.

Is CVE-2025-71382 being exploited?

CVE-2025-71382 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-71382 affect?

CVE-2025-71382 affects mupdf. Severity is medium (CVSS 6.5). 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 element

How urgent is CVE-2025-71382?

Priority 40/100. Public exploit reference

Related CVEs

CVE-2026-7233 LOW 3.3 UPGRADE A vulnerability was determined in Artifex MuPDF up to 1.28.0
CVE-2026-40505 LOW 3.3 UPGRADE MuPDF before 1.27 contains an ANSI injection vulnerability in mutool that allows attackers to inject arbitrary

References

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