Path Traversal in 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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.048 (91.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 91.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.361 · newest: 0.048 · change: -0.314
Affected products
- Langflow
- Langflow-Ai Langflow — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.tenable.com/security/research/tra-2026-26 (Third Party Advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-5027?
- CVE-2026-5027 is a high-severity vulnerability in 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?
- 9 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.