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CVE-2026-10134 – Unauthenticated RCE – IBM Langflow OSS 1.0.0 through 1.9.3

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Summary

CVE-2026-10134 is a critical, unauthenticated server-side Remote Code Execution (RCE) vulnerability in IBM Langflow OSS versions 1.0.0 through 1.9.3. The flaw stems from an insecure exec() call in the PythonCodeStructuredTool component that processes fully attacker-controlled Python code, and is exploitable without any credentials once a public flow exists on the target instance. It carries a perfect CVSS 3.1 base score of 10.0 (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H), reflecting complete network-accessible compromise with no prerequisites beyond a reachable Langflow instance.

Technical details

  • Root cause: The PythonCodeStructuredTool component executes user-supplied code via exec(self.tool_code, globals(), local_namespace) with no sandboxing. The tool_code field is fully attacker-controlled.
  • Unauthenticated attack path: When any legitimate user marks a flow as PUBLIC — a standard, supported Langflow feature — the endpoint POST /api/v1/build_public_tmp/{flow_id}/flow becomes accessible without an Authorization header. An unauthenticated attacker who knows or discovers the public flow’s UUID can trigger server-side Python execution immediately.
  • Persistence mechanism: An attacker can modify a public flow’s tool_code so that all subsequent legitimate POST /api/v1/build/... calls by any authenticated user silently re-execute the attacker’s payload, establishing a durable server-side backdoor.
  • Attack vector: Network (AV:N); no authentication required (PR:N); no user interaction (UI:N); scope change (S:C).
  • Impact: Full arbitrary code execution on the Langflow server. Confirmed post-exploitation capabilities include: exfiltration of all secrets accessible to the Langflow process; read and write access to every flow, conversation, message, file upload, and saved component in the Langflow database; Server-Side Request Forgery (SSRF) to internal services and cloud metadata endpoints; lateral movement to other tenants on the same Langflow instance; and persistent backdoor implantation.

Affected software

  • IBM Langflow OSS 1.0.0 through 1.9.3 (inclusive)

Severity

  • CVSS v3.1 Base Score: 10.0 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate — upgrade: Upgrade IBM Langflow OSS to version 1.10.0 or later, as recommended in the IBM Security Bulletin. Version 1.10.0 contains the vendor-provided fix for this vulnerability.
  • If immediate patching is not feasible:
    • Audit all existing flows and disable or restrict any flow marked as PUBLIC until the patch can be applied.
    • Restrict network access to the Langflow instance so that the /api/v1/build_public_tmp/ endpoint is not reachable from untrusted networks.
    • Review server-side process secrets and rotate any credentials accessible to the Langflow process.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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