# CVE-2018-1000039: Use after free in n/a

> Heap use-after-free bugs in MuPDF allow attackers to execute code, read memory, or cause denial of service via crafted PDF files.

- **Severity:** Medium 6.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 24 May 2018
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2018-1000039, GHSA-mv25-m6g9-hcg7, UBUNTU-CVE-2018-1000039

## What is CVE-2018-1000039?

CVE-2018-1000039 is a medium-severity use after free vulnerability in Artifex Mupdf, published on 24 May 2018. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

In Artifex MuPDF 1.12.0 and earlier, multiple heap use after free bugs in the PDF parser could allow an attacker to execute arbitrary code, read memory, or cause a denial of service via a crafted file.

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2018-1000039?

It affects 1 product.


Products: Artifex Mupdf.

## How do I fix CVE-2018-1000039?

Upgrade to a fixed version.

## Is CVE-2018-1000039 being exploited?

There is no known exploitation of CVE-2018-1000039 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-2018-1000039 and fix it if it is affected.

What it is: CVE-2018-1000039 is a medium-severity use after free vulnerability in Artifex Mupdf, published on 24 May 2018. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-1000039 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-2018-1000039/ (Markdown: https://insights.sbomify.com/CVE-2018-1000039/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-1000039
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-1000039
- OSV: https://osv.dev/vulnerability/CVE-2018-1000039

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-1000039/
Summaries are generated and may contain mistakes; the official description above is the record.