CVE-2026-81941Network attack vector

Authenticated command execution via unchecked MCP subprocess

Published Sep 10, 2026 · Updated Sep 10, 2026

OS command injection in IBM Langflow OSS 1.0.0 through 1.11.5 allows remote authenticated users to execute commands on the server. The MCP Tools component accepts a flow-supplied local stdio command and starts it as a subprocess without enforcing the custom-component or code-interpreter execution blocks. Any non-administrative account that can construct and run a flow can execute with the Langflow process's privileges, exposing its environment, files, and reachable services.

CVSS severityUnavailable
Unscored
EPSS probability0.76%
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 IBM Langflow OSS 1.0.0 through 1.11.5 allows remote authenticated users to execute commands on the server. The MCP Tools component accepts a flow-supplied local stdio command and starts it as a subprocess without enforcing the custom-component or code-interpreter execution blocks. Any non-administrative account that can construct and run a flow can execute with the Langflow process's privileges, exposing its environment, files, and reachable services.

The record

CVE
CVE-2026-81941
Published
Sep 10, 2026
Updated
Sep 10, 2026
Vendor
IBM
Product
Langflow OSS
Classifications
CWE-78, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 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=1.0.0 <=1.11.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · Langflow OSSversion=1.0.0 <=1.11.5

Published CVSS scores

No CVSS assessment is available in this record.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

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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