CVE-2025-66219
CVE-2025-66219 is a critical-severity vulnerability in Dontkry Willitmerge with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-77.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v4: 6.9
- EPSS exploit prediction: 2% (82nd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-199766
- Weakness: CWE-77
- Affected product: Dontkry Willitmerge
- Published:
- Last modified:
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.
Frequently asked questions
- What is 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.
- How severe is CVE-2025-66219?
- CVE-2025-66219 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2025-66219 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2025-66219?
- CVE-2025-66219 affects Dontkry Willitmerge. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2025-66219?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2025-66219 have an EU (EUVD) identifier?
- Yes. CVE-2025-66219 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199766.
- When was CVE-2025-66219 published?
- CVE-2025-66219 was published on 2025-11-29 and last updated on 2026-06-17.
References
- https://github.com/shama/willitmerge/blob/2fe91d05191fb05ac6da685828d109a3a5885028/lib/willitmerge.js#L189-L197
- https://github.com/shama/willitmerge/security/advisories/GHSA-j9wj-m24m-7jj6
Affected products (1)
- cpe:2.3:a:dontkry:willitmerge:*:*:*:*:*:node.js:*:*
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