CVE-2026-26015Public exploitNetwork attack vector

Unauthenticated RCE via STDIO transport override

Published Apr 29, 2026 · Updated Apr 29, 2026

Command injection in Arc53 DocsGPT 0.15.0 through 0.15.x allows remote attackers to execute arbitrary commands via MCP test requests. The test_connection flow validates server_url but honors an attacker-supplied transport_type of stdio, then _create_transport passes command and args into FastMCP StdioTransport. No authentication or user interaction is required when the backend API is network-reachable, and successful exploitation grants control of the DocsGPT service host.

CVSS severity10.0
Critical
EPSS probability1.17%
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 Arc53 DocsGPT 0.15.0 through 0.15.x allows remote attackers to execute arbitrary commands via MCP test requests. The test_connection flow validates server_url but honors an attacker-supplied transport_type of stdio, then _create_transport passes command and args into FastMCP StdioTransport. No authentication or user interaction is required when the backend API is network-reachable, and successful exploitation grants control of the DocsGPT service host.

The record

CVE
CVE-2026-26015
Published
Apr 29, 2026
Updated
Apr 29, 2026
Vendor
Arc53
Product
DocsGPT
Classifications
CWE-77, T1190, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=>= 0.15.0, < 0.16.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Arc53 · DocsGPTversion=>= 0.15.0, < 0.16.0

Published CVSS scores

10.0GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
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')
T1190Exploit Public-Facing Application
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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