CVE-2025-66219Public exploitNetwork attack vector

Shell command execution via concatenated repository input

Published Nov 29, 2025 · Updated Dec 1, 2025

Command injection in shama willitmerge 0.2.1 and earlier allows remote attackers to execute shell commands through repository input. The lib/willitmerge.js command builder concatenates remote URLs and pull-request branch references into strings passed to child_process.exec without neutralizing shell metacharacters. Exploitation requires a crafted remote value or attacker-controlled branch name to be processed, enabling file or command operations with the CLI process's privileges.

CVSS severity6.9
Medium
EPSS probability2.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in shama willitmerge 0.2.1 and earlier allows remote attackers to execute shell commands through repository input. The lib/willitmerge.js command builder concatenates remote URLs and pull-request branch references into strings passed to child_process.exec without neutralizing shell metacharacters. Exploitation requires a crafted remote value or attacker-controlled branch name to be processed, enabling file or command operations with the CLI process's privileges.

The record

CVE
CVE-2025-66219
Published
Nov 29, 2025
Updated
Dec 1, 2025
Vendor
shama
Product
willitmerge
Classifications
CWE-77, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 1, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 0.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

shama · willitmergeversion=<= 0.2.1

Published CVSS scores

6.9GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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