What is CVE-2026-8859?

CVE-2026-8859 is a critical-severity vulnerability in Ibm Langflow Oss, classified under Path Traversal. CVSS score: 9.9/10. Published 2026-07-17.

How severe is CVE-2026-8859?

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

Path Traversal in Ibm Langflow Oss

CVE-2026-8859

IBM Langflow OSS 1.0.0 through 1.10.0 Langflow could allow an attacker to write arbitrary files to unintended locations due to improper input validation in the APIRequest component. A path traversal vulnerability exists when the "Save to F…

Vulnerability class: Path Traversal (Directory Traversal)

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

Ibm Langflow Oss — versions 1.0.0

Weakness classification (CWE)

CWE-22 — Path Traversal

References

psirt@us.ibm.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-8859?: CVE-2026-8859 is a critical-severity vulnerability in Ibm Langflow Oss, classified under Path Traversal. CVSS score: 9.9/10. Published 2026-07-17.
How severe is CVE-2026-8859?: Critical severity. CVSS v3 base score is 9.9 out of 10.