Path Traversal in IBM Langflow Oss

CVE-2026-18899

IBM Langflow OSS 1.0.0 through 1.11.1 could allow a remote attacker to read arbitrary files due to path traversal.

Vulnerability class: Path Traversal (Directory Traversal)

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Ibm Langflow Oss

Weakness classification (CWE)

CWE-22 — Path Traversal

References

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

Frequently asked questions

What is CVE-2026-18899?: CVE-2026-18899 is a high-severity vulnerability in IBM Langflow Oss, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-08-28.
How severe is CVE-2026-18899?: High severity. CVSS v3 base score is 7.5 out of 10.