CVE-2026-27966

Name: CVE-2026-27966
Creator: NVD / NIST
Published: 2026-02-26T02:16:23.833+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 33.69%

Last modified Jun 17, 2026

CVE-2026-27966 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.8.0, the CSV Agent node in Langflow hardcodes `allow_dangerous_code=True`, which automatically exposes LangChain’s Python REPL tool (`python_repl_ast`). EPSS estimates a 33.69% chance of exploitation in the next 30 days.

Description

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.8.0, the CSV Agent node in Langflow hardcodes `allow_dangerous_code=True`, which automatically exposes LangChain’s Python REPL tool (`python_repl_ast`). As a result, an attacker can execute arbitrary Python and OS commands on the server via prompt injection, leading to full Remote Code Execution (RCE). Version 1.8.0 fixes the issue.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

33.69%

98.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-94

Affected Software

Vendor	Product	Versions
Langflow	Langflow	< 1.8.0

References

https://github.com/langflow-ai/langflow/commit/d8c6480daa17b2f2af0b5470cdf5c3d28dc9e508Patch
https://github.com/langflow-ai/langflow/security/advisories/GHSA-3645-fxcv-hqr4Exploit, Vendor Advisory

Timeline

Published: Feb 26, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-27966?

How severe is CVE-2026-27966?

CVE-2026-27966 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 33.69% probability of exploitation in the next 30 days.

How do I fix CVE-2026-27966?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-27966?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST