VulnTideExploited vulnerabilities, by vendor. Data as of .
Not in CISA KEVReported exploited: VulnCheck KEV since Published CVSS 10.0 criticalEPSS 13.5% probability of exploitation in 30 days
Langflow

CVE-2026-33309: Langflow has an Arbitrary File Write (RCE) via v2 API

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 . VulnCheck's own honeypots also recorded exploitation attempts.

How likely is exploitation in the next 30 days?
13.5%

Up from 1.1% on .

EPSS score, percentile 96.4 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?
10.0 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

  • >= 1.2.0, < 1.9.0

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 has an Arbitrary File Write (RCE) via v2 API

Langflow is a tool for building and deploying AI-powered agents and workflows. Versions 1.2.0 through 1.8.1 have a bypass of the patch for CVE-2025-68478 (External Control of File Name), leading to the root architectural issue within `LocalStorageService` remaining unresolved. Because the underlying storage layer lacks boundary containment checks, the system relies entirely on the HTTP-layer `ValidatedFileName` dependency. This defense-in-depth failure leaves the `POST /api/v2/files/` endpoint vulnerable to Arbitrary File Write. The multipart upload filename bypasses the path-parameter guard, allowing authenticated attackers to write files anywhere on the host system, leading to Remote Code Execution (RCE). Version 1.9.0 contains an updated fix.

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>= 1.2.0, < 1.9.0

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

Weakness

CWE-22, CWE-73, CWE-94, CWE-284
  • CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
  • CWE-73: External Control of File Name or Path
  • CWE-94: Improper Control of Generation of Code ('Code Injection')
  • CWE-284: Improper Access Control

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

Timeline

DateEvent
CVE record published
CVE record last updated

References

1

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 )