How severe is GHSA-hpr5-wp7c-hh5q?

No CVSS score has been assigned to GHSA-hpr5-wp7c-hh5q yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-hpr5-wp7c-hh5q?

GHSA-hpr5-wp7c-hh5q affects the following packages: mrk.js (npm). Ecosystems affected: npm.

How do I fix GHSA-hpr5-wp7c-hh5q?

Update mrk.js to 2.0.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-hpr5-wp7c-hh5q is resolved across your whole dependency graph.

How do I detect GHSA-hpr5-wp7c-hh5q in my npm dependencies?

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

How do I mitigate GHSA-hpr5-wp7c-hh5q if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is GHSA-hpr5-wp7c-hh5q actively exploited in the wild?

No public exploit code has been indexed for GHSA-hpr5-wp7c-hh5q 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-hpr5-wp7c-hh5q published, and has it been updated?

GHSA-hpr5-wp7c-hh5q was published on September 1, 2020 and was last updated on September 23, 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

Cross-Site Scripting in mrk.jsGHSA-hpr5-wp7c-hh5q

Fix: heyitsmeuralex/mrk#3

GHSA-hpr5-wp7c-hh5q is a security vulnerability in mrk.js. A fix is available for mrk.js — see the affected versions and patch details below.

Published

Sep 1, 2020

Updated

Sep 23, 2021

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Sep 23, 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, and reverse-dependency count shows how many other packages break if it stays unpatched.

0other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

mrk.jsnpm

7downloads / week

Description

Versions of mrk.js before 2.0.1 are vulnerable to cross-site scripting (XSS) when markdown is converted to HTML.

Recommendation

Update to version 2.0.1 or later and use mark.sanitizeURL() for any src and href attributes when extending the markdown.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`mrk.js`	all versions	2.0.1`npm install mrk.js@2.0.1`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for mrk.js, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update mrk.js to 2.0.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-hpr5-wp7c-hh5q is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

Versions of `mrk.js` before 2.0.1 are vulnerable to cross-site scripting (XSS) when markdown is converted to HTML. ## Recommendation Update to version 2.0.1 or later and use `mark.sanitizeURL()` for any `src` and `href` attributes when extending the markdown.

O3 Security · Impact-Aware SCA

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