# CVE-2018-6876: Memory corruption in n/a

> Remote attackers can cause a denial of service via a stack-based buffer under-read in the libfpx library used by ImageMagick.

- **Severity:** Medium 6.5 (`CVSS:3.0/AV:N/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:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 9 Feb 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-fgv7-56f2-9ww7

## What is CVE-2018-6876?

CVE-2018-6876 is a medium-severity memory corruption vulnerability in Imagemagick Imagemagick, published on 9 Feb 2018. 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

The OLEProperty class in ole/oleprop.cpp in libfpx 1.3.1-10, as used in ImageMagick 7.0.7-22 Q16 and other products, allows remote attackers to cause a denial of service (stack-based buffer under-read) via a crafted bmp image.

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

## Which versions are affected by CVE-2018-6876?

It affects 2 products.


Products: Imagemagick Imagemagick, Libfpx Project Libfpx.

## How do I fix CVE-2018-6876?

No fix has been published for CVE-2018-6876 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-6876 being exploited?

There is no known exploitation of CVE-2018-6876 in the wild and no public exploit code.

## Other vulnerabilities in Imagemagick Imagemagick

- [CVE-2019-19952](https://insights.sbomify.com/CVE-2019-19952/): Use after free in n/a (critical 9.8)
- [CVE-2018-16328](https://insights.sbomify.com/CVE-2018-16328/): Null dereference in n/a (critical 9.8)
- [CVE-2018-16329](https://insights.sbomify.com/CVE-2018-16329/): Null dereference in n/a (critical 9.8)
- [CVE-2017-18210](https://insights.sbomify.com/CVE-2017-18210/): Null dereference in n/a (critical 9.8)
- [CVE-2017-14138](https://insights.sbomify.com/CVE-2017-14138/): Denial of service in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-6876 and fix it if it is affected.

What it is: CVE-2018-6876 is a medium-severity memory corruption vulnerability in Imagemagick Imagemagick, published on 9 Feb 2018. 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-2018-6876 in the wild and no public exploit code.

Affected product: Imagemagick Imagemagick. 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-2018-6876/ (Markdown: https://insights.sbomify.com/CVE-2018-6876/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-6876
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-6876
- OSV: https://osv.dev/vulnerability/CVE-2018-6876

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-6876/
Summaries are generated and may contain mistakes; the official description above is the record.