GHSA-pxmp-fwjc-4x7q
GHSA-pxmp-fwjc-4x7q is a security vulnerability in marky-markdown. O3 Security confirms whether GHSA-pxmp-fwjc-4x7q is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
HTML Injection in marky-markdown
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, a proxy for how much of the ecosystem is exposed.
marky-markdownnpmDescription
All versions of marky-markdown are vulnerable to HTML Injection due to a validation bypass. The package only allows iframes where the source is youtube.com but it is possible to bypass the validation with sources where youtube.com is the sub-domain, such as youtube.com.evil.co. This
Recommendation
This package is no longer maintained. Please upgrade to @npmcorp/marky-markdown
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | marky-markdown | ≥ 0.0.0 | No fix |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for marky-markdown. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Remediation status
No patched version of marky-markdown has shipped for GHSA-pxmp-fwjc-4x7q yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Mitigate without a patch
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 pinpoints whether GHSA-pxmp-fwjc-4x7q is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-pxmp-fwjc-4x7q. 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-pxmp-fwjc-4x7q in your dependencies?
O3 detects GHSA-pxmp-fwjc-4x7q across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.