# GHSA-4cv2-xc5f-px8h: Denial of Service in extension "Code Highlight" (codehighlight)

> Attackers can cause denial of service in the Code Highlight extension via ReDoS in the bundled Prism library.

- **Severity:** Not scored
- **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:** 15 May 2024

## What is GHSA-4cv2-xc5f-px8h?

GHSA-4cv2-xc5f-px8h is a denial of service vulnerability in brotkrueml/codehighlight, published on 15 May 2024. 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 codehighlight extension bundles a vulnerable version of the 3rd party JavaScript component “prism” which is known to be vulnerable against Regular expression Denial of Service (ReDoS).

## Which versions are affected by GHSA-4cv2-xc5f-px8h?

2 open source packages ship an affected version, including brotkrueml/codehighlight.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `brotkrueml/codehighlight` | Packagist | All versions | 2.5.0 |
| `brotkrueml/codehighlight` | Packagist | All versions | 2.5.0 |

## How do I fix GHSA-4cv2-xc5f-px8h?

Upgrade brotkrueml/codehighlight to 2.5.0 or later.

## Is GHSA-4cv2-xc5f-px8h being exploited?

There is no known exploitation of GHSA-4cv2-xc5f-px8h in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for GHSA-4cv2-xc5f-px8h and fix it if it is affected.

What it is: GHSA-4cv2-xc5f-px8h is a denial of service vulnerability in brotkrueml/codehighlight, published on 15 May 2024. 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 GHSA-4cv2-xc5f-px8h in the wild and no public exploit code.

Affected packages and fixed versions:
- brotkrueml/codehighlight (Packagist): affected all versions; fixed in 2.5.0
- brotkrueml/codehighlight (Packagist): affected all versions; fixed in 2.5.0

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/GHSA-4cv2-xc5f-px8h/ (Markdown: https://insights.sbomify.com/GHSA-4cv2-xc5f-px8h/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/GHSA-4cv2-xc5f-px8h

---
From sbomify Insights: https://insights.sbomify.com/GHSA-4cv2-xc5f-px8h/
Summaries are generated and may contain mistakes; the official description above is the record.