Is CVE-2025-71382 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2025-71382 being exploited in the wild.

How severe is CVE-2025-71382?

Medium severity, with a CVSS score of 6.5, published 23 June 2026.

Which products and versions are affected?

Artifex Software MuPDF before 1.27.0-rc1.

Is there a fix for CVE-2025-71382?

A patch was published on 2025-10-19: Fix committed to MuPDF repository Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2025-71382 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2025-71382?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2025-71382: Artifex MuPDF uncontrolled recursion in EPUB CSS rendering

CVE-2025-71382 · Severity: medium · CVSS 6.5 · Published 2026-06-23

MuPDF, a widely used library for viewing PDF, XPS, and eBook documents, is vulnerable to a flaw that can cause applications to crash. By tricking a user into opening a specially crafted EPUB eBook file, an attacker can trigger a system crash, leading to a denial of service. This impact affects any software that relies on MuPDF to display eBook content.

Quick answers

Is CVE-2025-71382 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2025-71382 being exploited in the wild.
How severe is CVE-2025-71382?: Medium severity, with a CVSS score of 6.5, published 23 June 2026.
Which products and versions are affected?: Artifex Software MuPDF before 1.27.0-rc1.
Is there a fix for CVE-2025-71382?: A patch was published on 2025-10-19: Fix committed to MuPDF repository Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2025-71382 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2025-71382?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An uncontrolled recursion vulnerability exists in MuPDF's EPUB rendering component, specifically within the value_from_inheritable_property() function in css-apply.c. The engine fails to impose a depth limit when recursing through the CSS property inheritance chain for deeply nested HTML elements and inline styles. An attacker can exploit this by providing a maliciously crafted EPUB file containing thousands of nested tags, leading to stack exhaustion and a process crash. The issue is resolved in version 1.27.0-rc1 by replacing the recursive logic with an iterative approach.

Affected products

Artifex Software MuPDF before 1.27.0-rc1

Timeline

2025-09-13: disclosed: Initial bug report to Ghostscript Bugzilla
2025-10-19: patched: Fix committed to MuPDF repository
2026-06-23: advisory: NVD publication date

References

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