What is CVE-2026-33309?

CVE-2026-33309 is a critical-severity vulnerability in Langflow, classified under Path Traversal. CVSS score: 9.9/10. Published 2026-03-24.

How severe is CVE-2026-33309?

Critical severity. CVSS v3 base score is 9.9 out of 10.

RCE in Langflow

CVE-2026-33309

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 `Loca…

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.014 (69.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Langflow
Langflow-ai Langflow — versions >= 1.2.0, < 1.9.0

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-33309?: CVE-2026-33309 is a critical-severity vulnerability in Langflow, classified under Path Traversal. CVSS score: 9.9/10. Published 2026-03-24.
How severe is CVE-2026-33309?: Critical severity. CVSS v3 base score is 9.9 out of 10.