# CVE-2026-6694: Gimp: gimp file-png plugin: denial of service via oversized apng trns chunk

> A remote attacker can cause a denial of service in GIMP by providing a malicious APNG image with an oversized tRNS chunk, crashing the PNG plugin.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/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:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 3 Aug 2026
- **Updated:** 3 Aug 2026
- **Also known as:** DEBIAN-CVE-2026-6694, GHSA-qv8f-fvhh-gfqp, UBUNTU-CVE-2026-6694

## What is CVE-2026-6694?

CVE-2026-6694 is a medium-severity denial of service vulnerability in Redhat Enterprise Linux, published on 3 Aug 2026. 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

A flaw was found in GIMP's file-png plugin. A remote attacker can exploit this by crafting a malicious Animated Portable Network Graphics (APNG) image containing an oversized tRNS chunk. This can lead to a stack-based buffer overflow (CWE-121), causing the file-png plugin to crash and resulting in a Denial of Service (DoS) for the user.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2026-6694?

It affects 1 product.


Products: Redhat Enterprise Linux.

## How do I fix CVE-2026-6694?

Apply the vendor's patch.

## Is CVE-2026-6694 being exploited?

There is no known exploitation of CVE-2026-6694 in the wild and no public exploit code.

## Other vulnerabilities in Redhat Enterprise Linux

- [CVE-2018-14667](https://insights.sbomify.com/CVE-2018-14667/): Red Hat JBoss RichFaces Framework Expression Language Injection (critical 9.8, exploited in the wild)
- [CVE-2021-20325](https://insights.sbomify.com/CVE-2021-20325/): Missing fixes for CVE-2021-40438 and CVE-2021-26691 in the versions of httpd, as shipped in Red Hat Enterprise Linux 8.5.0, causes a securit (critical 9.8)
- [CVE-2018-25011](https://insights.sbomify.com/CVE-2018-25011/): Memory corruption in libwebp (critical 9.8)
- [CVE-2018-25014](https://insights.sbomify.com/CVE-2018-25014/): Other in libwebp (critical 9.8)
- [CVE-2014-3585](https://insights.sbomify.com/CVE-2014-3585/): Supply chain in redhat-upgrade-tool (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-6694 and fix it if it is affected.

What it is: CVE-2026-6694 is a medium-severity denial of service vulnerability in Redhat Enterprise Linux, published on 3 Aug 2026. 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: There is no known exploitation of CVE-2026-6694 in the wild and no public exploit code.

Affected product: Redhat Enterprise Linux. 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-2026-6694/ (Markdown: https://insights.sbomify.com/CVE-2026-6694/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-6694
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-6694
- OSV: https://osv.dev/vulnerability/CVE-2026-6694

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-6694/
Summaries are generated and may contain mistakes; the official description above is the record.