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CVE-2021-23639

CriticalPublished

Remote Code Execution (RCE)

Published: Dec 10, 2021
Updated: Sep 17, 2024
Assigning CNA: snyk
Evidence observed: Aug 5, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

5.3%

Low · next 30 days

Percentile: 92.3%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

The package md-to-pdf before 5.0.0 are vulnerable to Remote Code Execution (RCE) due to utilizing the library gray-matter to parse front matter content, without disabling the JS engine.

Sources

CVE-2021-23639Exploit
Exploit of CVE-2021-23639 for the vulnerable library 'md-to-pdf' in JS

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