CVE-2026-8859

critical · 9.9

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.

9.9

CVSS

0.6%

EPSS (exploit prob.)

45th

EPSS percentile

2026-07-17

Published

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Weaknesses

CWE-22

Affected products

Vendor	Product	Affected versions
langflow	langflow	>= 1.0.0, < 1.10.1
apple	macos	all versions
linux	linux_kernel	all versions
microsoft	windows	all versions

Check a specific version with /api/v1/cve/match.

References

https://www.ibm.com/support/pages/node/7278924

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-8859