CVE-2026-101861 Langflow Code Execution via eval() in Component Input Schema
Authenticated attackers can execute arbitrary code in Langflow by injecting malicious Python objects into component input schemas via unsafe eval usage.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-101861?
CVE-2026-101861 is a low-severity code injection vulnerability in langflow-ai langflow, published on 28 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-101861?
How do I fix CVE-2026-101861?
No fix has been published for CVE-2026-101861 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-101861 being exploited?
There is no known exploitation of CVE-2026-101861 in the wild and no public exploit code.
Sources
Also known as GHSA-33p4-w7j3-33mw.