CVE-2026-4199Public exploit

Local command execution via shell-interpolated package names

Published Mar 16, 2026 · Updated Mar 16, 2026

Command injection in MCP Code Executor 0.3.0 and earlier allows local users to execute commands through crafted dependency package names. The installDependencies function joins the packages array into shell command strings for conda, pip, or uv and passes them to child_process.exec. Access to the install_dependencies MCP tool is required, and injected commands run with the MCP server process's privileges.

CVSS severity5.3
Medium
EPSS probability0.70%
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 MCP Code Executor 0.3.0 and earlier allows local users to execute commands through crafted dependency package names. The installDependencies function joins the packages array into shell command strings for conda, pip, or uv and passes them to child_process.exec. Access to the install_dependencies MCP tool is required, and injected commands run with the MCP server process's privileges.

The record

CVE
CVE-2026-4199
Published
Mar 16, 2026
Updated
Mar 16, 2026
Vendor
bazinga012
Product
MCP Code Executor
Classifications
CWE-74, CWE-77, T1059
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 16, 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
  2. Affected versionversion=0.2
  3. Affected versionversion=0.3.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

bazinga012 · MCP Code Executorversion=0.1; version=0.2; version=0.3.0

Published CVSS scores

5.3VulDBCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
4.3VulDBAV:L/AC:L/Au:S/C:P/I:P/A:P
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

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-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('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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