Denial of Service in extension "Code Highlight" (codehighlight)GHSA-65xh-hh78-6454
MEDIUMFix: brotkrueml/codehighlight@c43d46eGHSA-65xh-hh78-6454 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.
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 | 2.7.0composer require brotkrueml/codehighlight:^2.7.0 |
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 2.7.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-65xh-hh78-6454 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.
Frequently Asked Questions
Is GHSA-65xh-hh78-6454 in your dependencies?
Find it across Packagist, including transitive dependencies.