VulnTideExploited vulnerabilities, by vendor. Data as of .
Not in CISA KEVReported exploited: VulnCheck KEV since Published CVSS 9.3 criticalEPSS 1.2% probability of exploitation in 30 days
Langflow

CVE-2026-55450: Langflow: Unauthenticated file upload leads to DoS (space exhaustion) and information leak

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of .

VulnCheck KEV lists it since . It cites 2 public reports, the first from .

How likely is exploitation in the next 30 days?
1.2%

EPSS score, percentile 67.9 of all scored records. A probability estimated by FIRST, not a report of exploitation.

CISA's SSVC assessment in the CVE record lists exploitation as poc.

How severe?
9.3 Critical

CVSS v3.1 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Affected

  • < 1.9.1

Versions by product

Source: CISA KEV 2026.10.29, as of ; VulnCheck KEV, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.

Description

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

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.

Source: CVE List, as of . About the data.

What to do

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Versions by product, as listed in the CVE record (1 product)
langflow-ai langflow
StatusVersions
Affected< 1.9.1

Source: CVE List, as of . About the data.

Weakness

CWE-200, CWE-306, CWE-400
  • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-306: Missing Authentication for Critical Function
  • CWE-400: Uncontrolled Resource Consumption

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

DateEvent
CVE record published

References

2

Known exploited Langflow vulnerabilities

  • CVE-2026-0770: Langflow Inclusion of Functionality from Untrusted Control Sphere Vulnerability (added )
  • CVE-2026-55255: Langflow Authorization Bypass Through User-Controlled Key Vulnerability (added )
  • CVE-2025-34291: Langflow Origin Validation Error Vulnerability (added )
  • CVE-2026-33017: Langflow Code Injection Vulnerability (added )
  • CVE-2025-3248: Langflow Missing Authentication Vulnerability (added )