What is CVE-2026-5027?

CVE-2026-5027 is a high-severity vulnerability in Langflow-ai Langflow, classified under Path Traversal. CVSS score: 8.8/10. Published 2026-03-27.

How severe is CVE-2026-5027?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2026-5027 known to be exploited?

4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Path Traversal in Langflow-ai Langflow

CVE-2026-5027

The 'POST /api/v2/files' endpoint does not sanitize the 'filename' parameter from the multipart form data, allowing an attacker to write files to arbitrary locations on the filesystem using path traversal sequences ('../').

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.000 (10.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Langflow-ai Langflow — versions 0

Weakness classification (CWE)

CWE-22 — Path Traversal

Public proof-of-concept exploits

References

www.tenable.com/security/research/tra-2026-26

Frequently asked questions

What is CVE-2026-5027?: CVE-2026-5027 is a high-severity vulnerability in Langflow-ai Langflow, classified under Path Traversal. CVSS score: 8.8/10. Published 2026-03-27.
How severe is CVE-2026-5027?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2026-5027 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.