CVE-2026-105740CWE-78command-injection

CVE-2026-105740

Critical · published October 6, 2026

CVSS v3.1
9.9
EPSS
1%
Percentile
47.4
In the wild
Unconfirmed
What it is

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.0, any authenticated Langflow user can achieve Remote Code Execution (RCE) on the server by adding an MCP server with the "Stdio" transport. The user-supplied command field is passed directly to bash -c "exec {command}" with zero validation, no allowlisting, and no sandboxing. The command executes immediately when the server list is fetched. Additionally, the env field allows arbitrary environment variable injection (e.g., LD_PRELOAD, PATH override). This vulnerability is fixed in 1.9.0.

The record
Technical detail
CVSS v3.1
9.9 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00589 · 47.4th percentile
Weakness
CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Published
2026-10-06T01:16Z
References (6)
https://github.com/langflow-ai/langflow/commit/efbc4a16e639409d938a4883463d27ef0bc637a0 · [email protected]https://github.com/langflow-ai/langflow/pull/12290 · [email protected]https://github.com/langflow-ai/langflow/security/advisories/GHSA-7w94-79vh-5mr2 · [email protected]https://github.com/langflow-ai/langflow/security/advisories/GHSA-w794-rj3p-xv45 · [email protected]https://github.com/langflow-ai/langflow/security/advisories/GHSA-7w94-79vh-5mr2 · 134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/langflow-ai/langflow/security/advisories/GHSA-w794-rj3p-xv45 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 07 OCT 03:39Z
    EPSS moved — → 1%
    epss
  • 05 OCT 20:46Z
    Langflow: Authenticated RCE via MCP Stdio transport allows any user to execute arbitrary OS commands on the server
    cvelistv5