Langflow - Path Traversal Arbitrary File Write via upload_user_file
90Vexday Risk Score
Patch now. It exploitation observed by VulnCheck and has a working public exploit.
ssvc Actcvss 8.8epss 31%
from disclosure to weapon6 days
Published on NVDMar 27
1st PoC+6d
VulnCheck+73d
exploitation probability
31%top 2% of all CVEs
observed exploitation
yesVulnCheck
6 public exploit(s)
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 ('../').
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
langflow-ai · langflowpublic PoCs found — 6
githubgithub.com/Layer-6/CVE-2026-5027-Langflow★ 0githubgithub.com/HORKimhab/-CVE-2026-5027★ 0vulncheckvulncheck.com/xdb/29b343b4afafunverifiedvulncheckvulncheck.com/xdb/812e19ecfa4funverifiedvulncheckvulncheck.com/xdb/98045a28f25cunverifiedvulncheckvulncheck.com/xdb/77b433ef98f1unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.