PatchTheCVECVE-2025-66219: willitmerge is a command line tool to check if pull requests are mergeable
CVE-2025-66219 is a critical-severity flaw (CVSS 9.8) affecting willitmerge. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- Critical severity
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 2.7% (top 14%) |
| CISA exploited list | No |
| Weakness | CWE-77 |
| Published | 2025-11-29 |
| Last modified | 2026-10-07 |
Last updated 2026-10-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Exact fixes by distribution
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2025-66219?
willitmerge: upgrade to newer than 0.2.1. Exact commands for each OS are on this page.
Is CVE-2025-66219 being exploited?
CVE-2025-66219 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2025-66219 affect?
CVE-2025-66219 affects willitmerge. Severity is critical (CVSS 9.8). 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
How urgent is CVE-2025-66219?
Priority 66/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action