# CVE-2012-5340: Integer overflow in n/a

> Remote attackers can cause a denial of service in SumatraPDF via a corrupt PDF file triggering an integer overflow.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/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:** 23 Jan 2020
- **Updated:** 13 Sep 2024
- **Also known as:** DEBIAN-CVE-2012-5340, GHSA-g8x3-qg8h-3qqr

## What is CVE-2012-5340?

CVE-2012-5340 is a high-severity vulnerability in Artifex Mupdf, published on 23 Jan 2020. 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

SumatraPDF 2.1.1/MuPDF 1.0 allows remote attackers to cause an Integer Overflow in the lex_number() function via a corrupt PDF file.

Weakness: CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2012-5340?

It affects 2 products.


Products: Artifex Mupdf, Sumatrapdfreader Sumatrapdf.

## How do I fix CVE-2012-5340?

Upgrade to a fixed version.

## Is CVE-2012-5340 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2012-5340 exists.

Public exploit code:

- SumatraPDF 2.1.1/MuPDF 1.0 - Integer Overflow (exploitdb)

## 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-2012-5340 and fix it if it is affected.

What it is: CVE-2012-5340 is a high-severity vulnerability in Artifex Mupdf, published on 23 Jan 2020. 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: It is not confirmed as exploited in the wild, but public exploit code for CVE-2012-5340 exists.

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-2012-5340/ (Markdown: https://insights.sbomify.com/CVE-2012-5340/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2012-5340
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2012-5340
- OSV: https://osv.dev/vulnerability/CVE-2012-5340

---
From sbomify Insights: https://insights.sbomify.com/CVE-2012-5340/
Summaries are generated and may contain mistakes; the official description above is the record.