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CVE-2026-55450

Langflow: Unauthenticated file upload leads to DoS (space exhaustion) and information leak

Published: Jun 23, 2026Updated: Jun 24, 2026 Sources: CVE List NVDCWE-200
9.3CRITICAL
NVD MITRE
EPSS Score
6.4%
Top 7.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:CC:LI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-200CWE-306CWE-400

Affected Products

langflow
commercialaka langflow desktop, langflow-base
langflowSaaS
AI / ML / ai-agent-tooling
langflow-ai
commercial
langflowSaaS
AI / ML

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

4 techniques
Collection
Impact
Initial Access
View detailed technique mapping

References

https://github.com/langflow-ai/langflow/pull/12831
github.com
https://github.com/langflow-ai/langflow/security/advisories/GHSA-x223-p2gf-v735
github.com
News mentions
2

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