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Vulnerability · Published Apr 20, 2026 · Assigned by VulDB

CVE-2026-6596langflow-ai langflow API Endpoint endpoints.py create_upload_file unrestricted upload

High 7.3

In plain English

A high-severity unrestricted file upload in langflow from langflow-ai. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.3High
Exploit odds (30 days)0.3%top 79.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

A security flaw has been discovered in langflow-ai langflow up to 1.1.0. This issue affects the function create_upload_file of the file src/backend/base/Langflow/api/v1/endpoints.py of the component API Endpoint. The manipulation results in unrestricted upload. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPIlangflow-base0.9.1GHSA-vvfc-fp59-m92g
PyPIlangflow-base0.9.1PYSEC-2026-2572

Affected products (as reported)

VendorProductVersions
langflow-ai langflow 1.01.1.0

Weakness: CWE-434, CWE-284 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

References