CVE-2026-27966

CRITICAL
2026-02-26 [email protected] GHSA-3645-fxcv-hqr4
9.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
PoC Detected
Feb 28, 2026 - 00:54 vuln.today
Public exploit code
Patch Released
Feb 28, 2026 - 00:54 nvd
Patch available
CVE Published
Feb 26, 2026 - 02:16 nvd
CRITICAL 9.8

Tags

Python RCE Command Injection AI / ML Langflow Langchain

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.

Analysis

Code injection in Langflow CSV Agent node before 1.8.0. The node hardcodes allow_dangerous_code=True, enabling arbitrary code execution through crafted CSV files. …

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Remediation

Within 24 hours: Identify all systems running Langflow versions prior to 1.8.0 and assess exposure (internet-facing, internal access, data sensitivity). Within 7 days: Apply vendor patch to upgrade all affected instances to version 1.8.0 or later, or implement network-level compensating controls if patching is delayed. …

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Priority Score

69
Low Medium High Critical
KEV: 0
EPSS: +0.4
CVSS: +49
POC: +20

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CVE-2026-27966 vulnerability details – vuln.today
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