CVE-2026-7590Public exploitNetwork attack vector

Unauthenticated command execution via shell-enabled dev_script

Published May 1, 2026 · Updated May 1, 2026

OS command injection in branch-monkey-mcp allows remote attackers to execute arbitrary commands through the Preview endpoint. The route in advanced.py copies request.dev_script into a command string and passes it to subprocess.Popen with shell=True, causing shell metacharacters to be interpreted. Exploitation requires network access to the local bridge plus a valid host-local Git repository path and existing commit, and successful commands run with the bridge process's permissions.

CVSS severity7.3
High
EPSS probability1.37%
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 branch-monkey-mcp allows remote attackers to execute arbitrary commands through the Preview endpoint. The route in advanced.py copies request.dev_script into a command string and passes it to subprocess.Popen with shell=True, causing shell metacharacters to be interpreted. Exploitation requires network access to the local bridge plus a valid host-local Git repository path and existing commit, and successful commands run with the bridge process's permissions.

The record

CVE
CVE-2026-7590
Published
May 1, 2026
Updated
May 1, 2026
Vendor
Eyal Goren
Product
branch-monkey-mcp
Classifications
CWE-77, CWE-78, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 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=69bc71874ce40050ef45fde5a435855f18af3373

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Eyal Goren · branch-monkey-mcpversion=69bc71874ce40050ef45fde5a435855f18af3373

Published CVSS scores

7.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
7.5VulDBAV:N/AC:L/Au:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS 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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