# CVE-2018-16647: Denial of service in n/a

> Remote attackers can cause a denial of service via a crafted PDF file in the MuPDF library, affecting applications using this component.

- **Severity:** Medium 5.5 (`CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 6 Sep 2018
- **Updated:** 12 Sep 2024
- **Also known as:** DEBIAN-CVE-2018-16647, GHSA-jrh7-3h3c-f5j3, UBUNTU-CVE-2018-16647

## What is CVE-2018-16647?

CVE-2018-16647 is a medium-severity denial of service vulnerability in Artifex Mupdf, published on 6 Sep 2018. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

In Artifex MuPDF 1.13.0, the pdf_get_xref_entry function in pdf/pdf-xref.c allows remote attackers to cause a denial of service (segmentation fault in fz_write_data in fitz/output.c) via a crafted pdf file.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2018-16647?

It affects 1 product.


Products: Artifex Mupdf.

## How do I fix CVE-2018-16647?

Upgrade to a fixed version.

## Is CVE-2018-16647 being exploited?

There is no known exploitation of CVE-2018-16647 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-2018-16647 and fix it if it is affected.

What it is: CVE-2018-16647 is a medium-severity denial of service vulnerability in Artifex Mupdf, published on 6 Sep 2018. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2018-16647 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-2018-16647/ (Markdown: https://insights.sbomify.com/CVE-2018-16647/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-16647
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-16647
- OSV: https://osv.dev/vulnerability/CVE-2018-16647

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-16647/
Summaries are generated and may contain mistakes; the official description above is the record.