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CVE-2026-55450

CRITICAL Exploitation: PoC
9.3
CVSS 3.1
Description
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, unauthenticated users can upload any amount of data to the server without any limitations. No need for any prior knowledge, only network access to Langflow. This can lead to space exhaustion on the server. In addition, in the response, the absolute path of the uploaded file is reported to the attacker, which is an information leak that can assist in chaining other primitives. This vulnerability is fixed in 1.9.1.

Metadata

CVE ID
CVE-2026-55450
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-16 21:59 UTC
Published
2026-06-23 16:17 UTC
Last updated
2026-06-23 17:02 UTC
Primary CWE
CWE-200
CWE-200: Exposure of Sensitive Information to an Unauthorize…
Vendor / Product
langflow-ai / langflow
Sources
cve.org  ·  NVD

Severity & Metrics

9.3 CRITICAL CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H
SSVC — CISA Coordinator
Exploitation
PoC
Automatable
yes
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
langflow-ai langflow — < 1.9.1
Weakness (CWE)
CWESourceDescription
CWE-200 cna CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
CWE-306 cna CWE-306: Missing Authentication for Critical Function
CWE-400 cna CWE-400: Uncontrolled Resource Consumption
CVSS scores (1)
ScoreSeverityVersionSourceVector
9.3 CRITICAL 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H
References (2)
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