CVE-2026-12940Network attack vectorHinoki check available

Unauthenticated code execution via Bash environment variables

Published Jul 30, 2026 · Updated Jul 30, 2026

OS command injection in IBM Langflow OSS 1.0.0 through 1.10.1 allows remote attackers to execute code without authentication. The MCP stdio launcher in src/lfx/src/lfx/base/mcp/util.py filters inherited environment variables with a blocklist that omits SHELLOPTS, BASHOPTS, and PS4 before starting a shell. A network-reachable MCP configuration path is sufficient to run arbitrary commands with the Langflow service process's privileges.

CVSS severity9.8
Critical
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

OS command injection in IBM Langflow OSS 1.0.0 through 1.10.1 allows remote attackers to execute code without authentication. The MCP stdio launcher in src/lfx/src/lfx/base/mcp/util.py filters inherited environment variables with a blocklist that omits SHELLOPTS, BASHOPTS, and PS4 before starting a shell. A network-reachable MCP configuration path is sufficient to run arbitrary commands with the Langflow service process's privileges.

The record

CVE
CVE-2026-12940
Published
Jul 30, 2026
Updated
Jul 30, 2026
Vendor
IBM
Product
Langflow OSS
Classifications
CWE-78, T1190, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 30, 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 <=1.10.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · Langflow OSSversion=1.0.0 <=1.10.1

Published CVSS scores

9.8IBMCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1190Exploit Public-Facing Application
T1059.004Unix Shell

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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