CVE-2026-5027
Langflow - Path Traversal Arbitrary File Write via upload_user_file
Description
The 'POST /api/v2/files' endpoint does not sanitize the 'filename' parameter from the multipart form data, allowing an attacker to write files to arbitrary locations on the filesystem using path traversal sequences ('../').
INFO
Published Date :
March 27, 2026, 3:17 p.m.
Last Modified :
March 30, 2026, 1:26 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Sanitize the 'filename' parameter in the multipart form data.
- Validate file paths before writing to the filesystem.
- Implement strict access controls for file operations.
Public PoC/Exploit Available at Github
CVE-2026-5027 has a 8 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-2026-5027.
| URL | Resource |
|---|---|
| https://www.tenable.com/security/research/tra-2026-26 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-5027 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-2026-5027
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).
CVE-2026 Docker vulnerability reproduction labs
Dockerfile Shell Python PowerShell PHP Java Lua JavaScript Handlebars
Daily Security News Analysis by Claude
PowerShell Python
A curated timeline of real AI agent security incidents, breaches, and vulnerabilities (2024-2026). Every entry sourced and dated.
ai-agent-security ai-agents ai-security awesome-list cybersecurity llm-security mcp-security prompt-injection supply-chain-security adversarial-attacks agent-security agentic-ai ai-attacks ai-safety cve incident-response owasp red-team security-research vulnerability
CVE-2026-5027
Python
Langflow, Remote Code Execution (RCE) via Cron Job Injection through Path Traversal
Python Dockerfile Shell
Langflow, Remote Code Execution (RCE) via Cron Job Injection through Path Traversal (CVE-2026-5027)
Python
CVE-2026-5027 - Langflow Path Traversal to Remote Code Execution (CVSS 8.8)
Python
None
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-5027 vulnerability anywhere in the article.
-
The Hacker News
Langflow RCE Exploited to Deploy Monero Miner on Exposed AI App Endpoints
Threat actors are continuing to exploit a critical Langflow vulnerability as part of fresh attacks designed to deliver a Monero cryptocurrency miner. The activity has been found to weaponize CVE-2026- ... Read more
-
The Hacker News
Unpatched Langflow Flaw CVE-2026-5027 Exploited for Unauthenticated RCE
A high-severity unpatched security flaw in Langflow, an open-source low-code platform to build artificial intelligence (AI) applications, has come under active exploitation in the wild, according to f ... Read more
The following table lists the changes that have been made to the
CVE-2026-5027 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.
-
New CVE Received by [email protected]
Mar. 27, 2026
Action Type Old Value New Value Added Description The 'POST /api/v2/files' endpoint does not sanitize the 'filename' parameter from the multipart form data, allowing an attacker to write files to arbitrary locations on the filesystem using path traversal sequences ('../'). Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-22 Added Reference https://www.tenable.com/security/research/tra-2026-26