CVE-2025-66219

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.

CVSS 4.0

6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

2.7% chance of exploitation in the next 30 days; higher than 85% of CVEs (scores of 2026-10-25)

CWE

CWE-77

Published

2025-11-29

Modified

2026-10-07

Record from

the NVD, synced 2026-10-19

Affected

• dontkry:willitmerge

Packages (OSV)

References

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

Check your stackJSON