RCE in Langflow-Ai Langflow
CVE-2026-101861
Langflow 1.0.16 before 1.12.0 and 0.0.94 before 1.12.0 contain an unsafe eval() vulnerability in schema.py that allows authenticated attackers to achieve code execution by placing a Python object with a malicious __repr__ method into component input options lists. The eval() sink is triggered when a component is converted into a LangChain tool via ComponentToolkit.get_tools(), including during custom component saves through the API, by interpolating options into a Literal type string that is passed directly to eval() without safe evaluation controls.
Vulnerability class: RCE (Remote Code Execution)
Published .
CVSS v3 metric
CVSS v3 base score 4.1 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/langflow-ai/langflow/security/advisories/GHSA-33p4-w7j3-33mw (vendor-advisory)
- github.com/langflow-ai/langflow/releases (release-notes, patch)
Frequently asked questions
- What is CVE-2026-101861?
- CVE-2026-101861 is a medium-severity vulnerability in Langflow-Ai Langflow, classified under Code Injection. CVSS score: 4.1/10. Published 2026-09-28.
- How severe is CVE-2026-101861?
- Medium severity. CVSS v3 base score is 4.1 out of 10.