CVE-2026-27966
Langflow has Remote Code Execution in CSV Agent
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.
INFO
Published Date :
Feb. 26, 2026, 2:16 a.m.
Last Modified :
Feb. 28, 2026, 12:54 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update Langflow to version 1.8.0 or later.
- Remove or restrict the Python REPL tool if possible.
- Sanitize user inputs to prevent prompt injection.
Public PoC/Exploit Available at Github
CVE-2026-27966 has a 5 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-27966.
| URL | Resource |
|---|---|
| https://github.com/langflow-ai/langflow/commit/d8c6480daa17b2f2af0b5470cdf5c3d28dc9e508 | Patch |
| https://github.com/langflow-ai/langflow/security/advisories/GHSA-3645-fxcv-hqr4 | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-27966 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-27966
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Exploit Tools For new CVE
Python
这是一个每天同步Vulnerability-Wiki中docs-base中内容的项目
HTML
一个 CVE 漏洞预警知识库，无 exp/poc，部分包含修复方案。A knowledge base of CVE security vulnerability, no PoCs/exploits.
一个漏洞 PoC 知识库。A knowledge base for vulnerability PoCs(Proof of Concept), with 1k+ vulnerabilities.
poc
Dockerfile Java Python
📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.
security cve exploit poc vulnerability
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-27966 vulnerability anywhere in the article.
-
CybersecurityNews
Langflow’s AI CSV Agent Vulnerability Allows Remote Code Execution Attacks
Langflow’s AI CSV Agent Vulnerability A critical vulnerability in a popular AI application platform allows attackers to remotely execute harmful code through its CSV data-processing agent.The vulnerab ... Read more
-
Daily CyberSecurity
Critical 9.8 Flaw in Langflow’s AI CSV Agent Opens a Direct Path to Root Shell
Artificial intelligence is making it easier than ever to build complex applications, but a newly discovered vulnerability shows that these same tools can inadvertently leave the front door wide open f ... Read more
The following table lists the changes that have been made to the
CVE-2026-27966 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Feb. 28, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:* versions up to (excluding) 1.8.0 Added Reference Type GitHub, Inc.: https://github.com/langflow-ai/langflow/commit/d8c6480daa17b2f2af0b5470cdf5c3d28dc9e508 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/langflow-ai/langflow/security/advisories/GHSA-3645-fxcv-hqr4 Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Feb. 27, 2026
Action Type Old Value New Value Removed Reference https://github.com/langflow-ai/langflow/security/advisories/GHSA-3645-fxcv-hqr4 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Feb. 26, 2026
Action Type Old Value New Value Added Reference https://github.com/langflow-ai/langflow/security/advisories/GHSA-3645-fxcv-hqr4 -
New CVE Received by [email protected]
Feb. 26, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-94 Added Reference https://github.com/langflow-ai/langflow/commit/d8c6480daa17b2f2af0b5470cdf5c3d28dc9e508 Added Reference https://github.com/langflow-ai/langflow/security/advisories/GHSA-3645-fxcv-hqr4