# CVE-2016-6491: Memory corruption in n/a

> Remote attackers can cause a denial of service via a crafted image due to a buffer overflow in ImageMagick.

- **Severity:** High 8.8 (`CVSS:3.0/AV:N/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:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 13 Dec 2016
- **Updated:** 6 Aug 2024
- **Also known as:** ALPINE-CVE-2016-6491, DEBIAN-CVE-2016-6491, GHSA-78fx-5w4q-gxw3, UBUNTU-CVE-2016-6491

## What is CVE-2016-6491?

CVE-2016-6491 is a high-severity memory corruption vulnerability in Imagemagick Imagemagick, published on 13 Dec 2016. 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

Buffer overflow in the Get8BIMProperty function in MagickCore/property.c in ImageMagick before 6.9.5-4 and 7.x before 7.0.2-6 allows remote attackers to cause a denial of service (out-of-bounds read, memory leak, and crash) via a crafted image.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2016-6491?

It affects 2 products.


Products: Imagemagick Imagemagick, Oracle Solaris.

## How do I fix CVE-2016-6491?

Upgrade to a fixed version.

## Is CVE-2016-6491 being exploited?

There is no known exploitation of CVE-2016-6491 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-2016-6491 and fix it if it is affected.

What it is: CVE-2016-6491 is a high-severity memory corruption vulnerability in Imagemagick Imagemagick, published on 13 Dec 2016. 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-2016-6491 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-2016-6491/ (Markdown: https://insights.sbomify.com/CVE-2016-6491/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-6491
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-6491
- OSV: https://osv.dev/vulnerability/CVE-2016-6491

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From sbomify Insights: https://insights.sbomify.com/CVE-2016-6491/
Summaries are generated and may contain mistakes; the official description above is the record.