# CVE-2019-7321: Memory corruption in n/a

> An attacker can execute arbitrary code via a heap overflow in the JPEG loading function of the MuPDF library.

- **Severity:** Critical 9.8 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Jun 2019
- **Updated:** 11 Sep 2024
- **Also known as:** GHSA-h4r8-57xx-v3q2

## What is CVE-2019-7321?

CVE-2019-7321 is a critical memory corruption vulnerability in Artifex Mupdf, published on 13 Jun 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Usage of an uninitialized variable in the function fz_load_jpeg in Artifex MuPDF 1.14 can result in a heap overflow vulnerability that allows an attacker to execute arbitrary code.

Weakness: CWE-908 (Use of Uninitialized Resource), CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2019-7321?

It affects 1 product.


Products: Artifex Mupdf.

## How do I fix CVE-2019-7321?

No fix has been published for CVE-2019-7321 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-7321 being exploited?

There is no known exploitation of CVE-2019-7321 in the wild and no public exploit code.

## Other vulnerabilities in Artifex Mupdf

- [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)
- [CVE-2020-16600](https://insights.sbomify.com/CVE-2020-16600/): Use after free in n/a (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-7321 and fix it if it is affected.

What it is: CVE-2019-7321 is a critical memory corruption vulnerability in Artifex Mupdf, published on 13 Jun 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-7321 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-2019-7321/ (Markdown: https://insights.sbomify.com/CVE-2019-7321/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-7321
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-7321
- OSV: https://osv.dev/vulnerability/CVE-2019-7321

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-7321/
Summaries are generated and may contain mistakes; the official description above is the record.