# CVE-2007-2756: Denial of service in n/a

> An attacker can cause a denial of service via CPU consumption by tricking a user into opening a crafted PNG image in applications using libgd.

- **Severity:** Medium 4.3 (`AV:N/AC:M/Au:N/C:N/I:N/A:P`)
- **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:** 18 May 2007
- **Updated:** 7 Aug 2024
- **Also known as:** DEBIAN-CVE-2007-2756, GHSA-2rm4-pxv9-x75c

## What is CVE-2007-2756?

CVE-2007-2756 is a medium-severity denial of service vulnerability in n/a, published on 18 May 2007. 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 gdPngReadData function in libgd 2.0.34 allows user-assisted attackers to cause a denial of service (CPU consumption) via a crafted PNG image with truncated data, which causes an infinite loop in the png_read_info function in libpng.

## Which versions are affected by CVE-2007-2756?

It affects 1 product.


Products: Libgd Libgd.

## How do I fix CVE-2007-2756?

Upgrade to a fixed version.

## Is CVE-2007-2756 being exploited?

There is no known exploitation of CVE-2007-2756 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2016-10166](https://insights.sbomify.com/CVE-2016-10166/): Integer overflow in n/a (critical 9.8)
- [CVE-2016-6912](https://insights.sbomify.com/CVE-2016-6912/): Use after free in n/a (critical 9.8)
- [CVE-2016-8670](https://insights.sbomify.com/CVE-2016-8670/): Integer overflow in n/a (critical 9.8)
- [CVE-2016-5767](https://insights.sbomify.com/CVE-2016-5767/): Integer overflow in n/a (high 8.8)
- [CVE-2017-6363](https://insights.sbomify.com/CVE-2017-6363/): Memory corruption in n/a (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2007-2756 and fix it if it is affected.

What it is: CVE-2007-2756 is a medium-severity denial of service vulnerability in n/a, published on 18 May 2007. 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-2007-2756 in the wild and no public exploit code.

Affected product: n/a. 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-2007-2756/ (Markdown: https://insights.sbomify.com/CVE-2007-2756/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2007-2756
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2007-2756
- OSV: https://osv.dev/vulnerability/CVE-2007-2756

---
From sbomify Insights: https://insights.sbomify.com/CVE-2007-2756/
Summaries are generated and may contain mistakes; the official description above is the record.