CVE-2026-101861

Langflow Code Execution via eval() in Component Input Schema

State: Published
Severity: 2.1 Low
Published: Sep 28, 2026
Updated: Oct 1, 2026
Reserved: Sep 28, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	2.1 Low	CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N	VulnCheck
3.1	4.1 Medium	CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L	VulnCheck

Weaknesses

CWE-95 Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')
CWE-94 Improper Control of Generation of Code ('Code Injection')

Affected Products

Product	Versions
langflowlangflow-ai	1.0.16 to before 1.12.0Affected 0.0.94 to before 1.12.0Affected

References

GitHub Security Advisory (GHSA-33p4-w7j3-33mw)vendor-advisory
Release Notesrelease-notespatch

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