What’s Vulnerable › Vulnerabilities

CVE-2021-23639: Remote Code Execution (RCE)

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-12-10 · updated 2026-06-17

Description

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.

Affected products

• md-to-pdf: before 5.0.0 — fixed in 5.0.0

How to fix

Upgrade to a fixed version: md-to-pdf 5.0.0. Check the vendor advisory for mitigations.

References

• https://github.com/simonhaenisch/md-to-pdf/commit/a716259c548c82fa1d3b14a3422e9100619d2d8a
• https://github.com/simonhaenisch/md-to-pdf/issues/99
• https://snyk.io/vuln/SNYK-JS-MDTOPDF-1657880
• https://github.com/simonhaenisch/md-to-pdf/commit/a716259c548c82fa1d3b14a3422e9100619d2d8a
• https://github.com/simonhaenisch/md-to-pdf/issues/99
• https://snyk.io/vuln/SNYK-JS-MDTOPDF-1657880

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