VulnerabilityAnalyzed

CVE-2026-27966

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`).

CRITICAL 9.8EPSS 33.7%

Does this matter?

EPSS puts the probability of exploitation in the next 30 days at 33.7%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.

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.

CVSS 3.1: 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 33.69% probability · 98th percentile
CISA KEV: Not listed
Weakness: CWE-94
Affected: langflow/langflow
Source: security-advisories@github.com

References

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.