Unrestricted File Upload in Langflow AI by Langflow
CVE-2026-6596

6.9MEDIUM

Key Information:

Vendor

Langflow-ai

Status
Langflow
Vendor
CVE Published:
20 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-6596?

A vulnerability has been identified in Langflow AI impacting versions up to 1.1.0. This flaw resides in the 'create_upload_file' function within the API endpoint, allowing unauthorized file uploads without proper validation. As a result, attackers can exploit this vulnerability remotely to upload malicious files. Notably, this exploit has been made public, raising concerns for potential attacks. Despite early notifications to the vendor, no response was received regarding this critical issue.

Affected Version(s)

langflow 1.0

langflow 1.1.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-6596 - Proof of Concept

References

https://vuldb.com/vuln/358231
vdb-entrytechnical-description
https://vuldb.com/vuln/358231/cti
signaturepermissions-required
https://vuldb.com/submit/791919
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Eric-d (VulDB User)
VulDB CNA Team
.