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

> Remote attackers can crash applications using MuPDF for EPUB rendering by supplying a maliciously crafted file with deeply nested elements.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 23 Jun 2026
- **Updated:** 14 Jul 2026
- **Also known as:** DEBIAN-CVE-2025-71382, GHSA-mhwh-83qc-j6x4, UBUNTU-CVE-2025-71382

## What is CVE-2025-71382?

CVE-2025-71382 is a high-severity denial of service vulnerability in Artifex Mupdf, published on 23 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### 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.

Weakness: CWE-674 (Uncontrolled Recursion)

## Which versions are affected by CVE-2025-71382?

It affects 1 product.


Products: Artifex Mupdf.

## How do I fix CVE-2025-71382?

Upgrade to a fixed version.

## Is CVE-2025-71382 being exploited?

There is no known exploitation of CVE-2025-71382 in the wild and no public exploit code.

## Other vulnerabilities in Artifex Mupdf

- [CVE-2019-7321](https://insights.sbomify.com/CVE-2019-7321/): Memory corruption in n/a (critical 9.8)
- [CVE-2016-6525](https://insights.sbomify.com/CVE-2016-6525/): Memory corruption in n/a (critical 9.8)
- [CVE-2011-0341](https://insights.sbomify.com/CVE-2011-0341/): Memory corruption in n/a (critical 9.3)
- [CVE-2016-8728](https://insights.sbomify.com/CVE-2016-8728/): Memory corruption in MuPDF (high 8.6)
- [CVE-2021-3407](https://insights.sbomify.com/CVE-2021-3407/): Use after free in mupdf (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-71382 and fix it if it is affected.

What it is: CVE-2025-71382 is a high-severity denial of service vulnerability in Artifex Mupdf, published on 23 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2025-71382 in the wild and no public exploit code.

Affected product: Artifex Mupdf. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-71382/ (Markdown: https://insights.sbomify.com/CVE-2025-71382/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-71382
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-71382
- OSV: https://osv.dev/vulnerability/CVE-2025-71382

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From sbomify Insights: https://insights.sbomify.com/CVE-2025-71382/
Summaries are generated and may contain mistakes; the official description above is the record.