Path Traversal in Apple macOS

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 File" feature is enabled, where filenames extracted from HTTP response Content-Disposition headers are not sanitized before being joined to the temporary directory path. An attacker controlling an external HTTP server can supply crafted filename values containing path traversal sequences (e.g., ../), enabling arbitrary file writes to locations accessible by the Langflow process.

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.006 (44.3th percentile) — read the EPSS interpretation.

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

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-8859?
CVE-2026-8859 is a critical-severity vulnerability in Apple macOS, 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.