CVE-2025-59717: do-markdownit — Exploit

Description

In the @digitalocean/do-markdownit package through 1.16.1 (in npm), the callout and fence_environment plugins perform .includes substring matching if allowedClasses or allowedEnvironments is a string (instead of an array).

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CVSS v3.1 Score

5.4

MEDIUM

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

Weakness Type (CWE)

CWE-843 CWE-843

Affected Products

Vendor	Product	Versions
digitalocean	do-markdownit	< 1.16.1

References

Exploits

https://gist.github.com/thesmartshadow/dd19665f1f51a4e3c7a766e70c9eafd0 https://gist.github.com/thesmartshadow/dd19665f1f51a4e3c7a766e70c9eafd0

Other References

https://github.com/digitalocean/do-markdownit https://www.npmjs.com/package/@digitalocean/do-markdownit

Frequently Asked Questions

What is CVE-2025-59717? +

In the @digitalocean/do-markdownit package through 1.16.1 (in npm), the callout and fence_environment plugins perform .includes substring matching if allowedClasses or allowedEnvironments is a string (instead of an array). It has a CVSS v3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2025-59717? +

CVE-2025-59717 has a CVSS v3.1 score of 5.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-59717? +

CVE-2025-59717 affects products from digitalocean, specifically: do-markdownit. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-59717? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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