CriticalVulnerability

CVE-2026-8859: IBM Langflow OSS path traversal in APIRequest Save to File feature

Source: NVD(opens in a new tab)
Identifier: CVE-2026-8859
Published: July 17, 2026
Record updated: October 9, 2026

Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.6%

Summary

IBM Langflow OSS versions 1.0.0 through 1.10.0 contain a path traversal flaw in the APIRequest component. When the "Save to File" feature is enabled, filenames taken from HTTP response Content-Disposition headers are joined to the temporary directory path without sanitization. An attacker controlling an external HTTP server can supply filenames containing ../ sequences, allowing arbitrary file writes to locations the Langflow process can access.

Mitigation

The source does not state a fix yet. Check the original advisory for updates.

Details

Scores and exploitation

CVSS score: 9.9(critical)
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack vector: network
Attack complexity: low
Privileges required: low
User interaction: none
EPSS: 0.6%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on November 12, 2026.
Disclosure date: July 17, 2026

Weaknesses and techniques

Weakness (CWE): CWE-22
Attack pattern (CAPEC): CAPEC-126

Classification

Attack type: Other
Attack sophistication: Moderate
AI component targeted: Framework
Impact: Integrity
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-8859

First tracked: July 17, 2026 at 08:07 PM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 90% (self-assessed)

Summary

Mitigation

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