EUVD-2026-51244
GHSA-h7x8-fr4c-w46c
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Network-reachable, low-complexity code injection needing a low-privileged account (PR:L); sandbox escape crosses the security boundary (S:C) yielding full host compromise (C/I/A:H).
Primary rating from Vendor (ibm).
CVSS VectorVendor: ibm
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
IBM Langflow OSS 1.0.0 through 1.10.1 contains an improper input validation vulnerability in the PythonREPL sandbox implementation.
AnalysisAI
Remote code execution in IBM Langflow OSS 1.0.0 through 1.10.1 stems from improper input validation in the PythonREPL sandbox, allowing a low-privileged authenticated user to escape the sandbox and run arbitrary Python. Because the flaw carries a scope-changing CVSS 3.1 score of 9.9 (S:C, C/I/A all High), a successful exploit can compromise the underlying host beyond the intended sandbox boundary. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target Langflow OSS instance (versions 1.0.0-1.10.1) exposes the PythonREPL sandbox component and that the attacker holds low-privileged authenticated access (PR:L) to reach and supply input to it; no user interaction by a victim is needed (UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H = 9.9) signals a network-reachable, low-complexity attack needing only low privileges, no user interaction, and delivering full confidentiality, integrity, and availability impact with a scope change - a genuinely high-priority profile for any exposed Langflow instance. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has obtained a low-privileged Langflow account crafts a flow (or API request) that feeds specially malformed input into the PythonREPL component, exploiting the incomplete input validation to break out of the sandbox and execute arbitrary Python on the server. Given the scope change (S:C), the attacker can then pivot to the underlying host, access credentials or connected data stores, and disrupt the service. … |
| Remediation | Patch available per vendor advisory: upgrade IBM Langflow OSS to the fixed release identified in IBM's advisory at https://www.ibm.com/support/pages/node/7279987 (the input data does not include an exact fixed version number, so confirm the target version directly from that advisory before deploying). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: conduct a complete inventory of all IBM Langflow OSS instances in production, identify those running versions 1.0.0 through 1.10.1, and implement network segmentation or access restrictions to limit exposure. …
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External POC / Exploit Code
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