CVE-2026-8859 Details
Description
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.
A path traversal vulnerability has been identified in IBM Langflow OSS versions 1.0.0 through 1.10.0. The issue arises in the APIRequest component when the 'Save to File' feature is enabled. Filenames extracted from HTTP response Content-Disposition headers are not properly sanitized before being appended to the temporary directory path. This allows an attacker controlling an external HTTP server to send crafted filename values that include path traversal sequences, enabling arbitrary file writes to locations accessible by the Langflow process. In the official Docker image, this vulnerability could be exploited to execute remote code by writing malicious .pth files to the site-packages directory, which would be executed on the next container restart.
Users are advised to upgrade IBM Langflow OSS to version 1.10.1.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 22, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://www.ibm.com/support/pages/node/7278924 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-22 | Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| langflow langflow | >= 1.0.0, < 1.10.1 |
CPE
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| apple macos | All versions |
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| linux linux kernel | All versions |
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| microsoft windows | All versions |
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 23, 2026 | CVE Modified | CISA-ADP |
| Jul 20, 2026 | Initial Analysis | [email protected] |
| Jul 20, 2026 | CVE Modified | CISA-ADP |
| Jul 17, 2026 | New CVE Received | [email protected] |