How severe is GHSA-pxmp-fwjc-4x7q?

No CVSS score has been assigned to GHSA-pxmp-fwjc-4x7q yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-pxmp-fwjc-4x7q?

GHSA-pxmp-fwjc-4x7q affects the following packages: marky-markdown (npm). Ecosystems affected: npm.

How do I fix GHSA-pxmp-fwjc-4x7q?

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.

How do I detect GHSA-pxmp-fwjc-4x7q in my npm dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for marky-markdown, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-pxmp-fwjc-4x7q if there is no patch (or I can't update yet)?

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.

Is GHSA-pxmp-fwjc-4x7q actively exploited in the wild?

No public exploit code has been indexed for GHSA-pxmp-fwjc-4x7q yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

When was GHSA-pxmp-fwjc-4x7q published, and has it been updated?

GHSA-pxmp-fwjc-4x7q was published on September 3, 2020 and was last updated on October 4, 2021. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦 npm

Not in CISA KEV

HTML Injection in marky-markdownGHSA-pxmp-fwjc-4x7q

GHSA-pxmp-fwjc-4x7q is a security vulnerability in marky-markdown. No vendor fix is recorded yet; mitigation options are listed below.

Published

Sep 3, 2020

Updated

Oct 4, 2021

Affected

1 pkg

Patched

None yet

Exploits

None indexed

Exploitation data as of Oct 4, 2021 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, a proxy for how much of the ecosystem is exposed.

marky-markdownnpm

293downloads / week

Description

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

1 total

Ecosystem	Package	Vulnerable range	Fix
📦npm	`marky-markdown`	≥ 0.0.0	No fix

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for marky-markdown, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
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.

Frequently Asked Questions

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`

O3 Security · Impact-Aware SCA

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