GHSA-4cv2-xc5f-px8h is a medium-severity (CVSS 5) vulnerability in brotkrueml/codehighlight. A fix is available for brotkrueml/codehighlight — see the affected versions and patch details below.
Denial of Service in extension "Code Highlight" (codehighlight)
Real-World Exposure
brotkrueml/codehighlightReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.
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).
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | brotkrueml/codehighlight | all versions | 2.5.0composer require brotkrueml/codehighlight:^2.5.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for brotkrueml/codehighlight, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update brotkrueml/codehighlight to 2.5.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-4cv2-xc5f-px8h is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-4cv2-xc5f-px8h can be triaged on real exposure rather than presence alone.
Tailored to GHSA-4cv2-xc5f-px8h. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-4cv2-xc5f-px8h in your dependencies?
O3 Security finds GHSA-4cv2-xc5f-px8h across Packagist dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.