Unratedamended

HTML Injection in marky-markdown

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

Add to your agent

Affected packages

npm marky-markdown
Affected
every version
Fixed in
no fixed version recorded

Sources

Open Source Vulnerabilities (OSV.dev), including the GitHub Advisory Database
OSV record GHSA-pxmp-fwjc-4x7q lists affected ranges: npm marky-markdown >=0.0.0
VerifiedObserved 24 Oct 2026, 04:13 UTCStructured OSV record; GitHub-reviewed advisory.
GitHub Advisory Database and maintainer security advisories on GitHub
GitHub-reviewed advisory GHSA-pxmp-fwjc-4x7q lists affected ranges: npm marky-markdown >=0.0.0
VerifiedObserved 26 Oct 2026, 12:09 UTCStructured GitHub Advisory Database record (type=reviewed) from the GitHub REST API.

Severity and exploitation

Exploitation: No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS: not scored
EPSS: No dated EPSS signal available.

Source description

As published by the source; long descriptions are shortened.

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 This Recommendation This package is no longer maintained.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

Dates and revisions

Published by the source: 3 Sep 2020, 15:45 UTC
Last modified by the source: 9 Jan 2023, 05:04 UTC
Source last checked: 26 Oct 2026, 12:09 UTC

Revision 2 · amended · 26 Oct 2026
Amended from ghsa record GHSA-pxmp-fwjc-4x7q
Revision 1 · created · 24 Oct 2026
Published from osv record GHSA-pxmp-fwjc-4x7q

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: GHSA-pxmp-fwjc-4x7q

Advisory: HTML Injection in marky-markdown
IDs: GHSA-pxmp-fwjc-4x7q
Record: https://patchnext.com/advisories/ghsa-pxmp-fwjc-4x7q (revision 2, source checked 26 Oct 2026, 12:09 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm marky-markdown: affected every version

## Suggested inspection (read-only)
- `npm ls marky-markdown --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on marky-markdown.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-pxmp-fwjc-4x7q (OSV record GHSA-pxmp-fwjc-4x7q lists affected ranges: npm marky-markdown >=0.0.0)
- Verified: https://github.com/advisories/GHSA-pxmp-fwjc-4x7q (GitHub-reviewed advisory GHSA-pxmp-fwjc-4x7q lists affected ranges: npm marky-markdown >=0.0.0)

Commands are suggestions: review each one before running it.

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