CVE-2026-5621Public exploit

Local command execution via unsanitized config_path

Published Apr 6, 2026 · Updated Apr 6, 2026

OS command injection in Vale MCP Server 0.1.0 allows local users to execute commands through a crafted config_path argument. The check_file and check_text handlers pass config_path into shell command strings that vale-runner.ts executes with execAsync or exec without neutralizing shell metacharacters. Access to a tool handler that reaches either sink is required, and injected commands run with the server process's privileges, permitting host data access, modification, or service interruption.

CVSS severity4.8
Medium
EPSS probability1.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Vale MCP Server 0.1.0 allows local users to execute commands through a crafted config_path argument. The check_file and check_text handlers pass config_path into shell command strings that vale-runner.ts executes with execAsync or exec without neutralizing shell metacharacters. Access to a tool handler that reaches either sink is required, and injected commands run with the server process's privileges, permitting host data access, modification, or service interruption.

The record

CVE
CVE-2026-5621
Published
Apr 6, 2026
Updated
Apr 6, 2026
Vendor
Chris Chinchilla
Product
Vale MCP Server
Classifications
CWE-78, CWE-77, T1059
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 6, 2026Record 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=0.1.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Chris Chinchilla · Vale MCP Serverversion=0.1.0

Published CVSS scores

1.9VulDBCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
5.3VulDBCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
4.8VulDBCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
4.3VulDBAV:L/AC:L/Au:S/C:P/I:P/A:P

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
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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