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CVE-2026-8859— Path Traversal in APIRequest Component via Content-Disposition Header

Quick assessment

Affected
IBM Langflow OSS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

IBM Langflow OSS是美国IBM公司的一个开源的低代码可视化AI工作流构建工具，它让开发者能通过拖拽组件的方式快速搭建、部署和迭代AI智能体与RAG应用，同时支持用Python进行深度定制以集成企业系统。 IBM Langflow OSS 1.0.0版本至1.10.0版本存在路径遍历漏洞，该漏洞源于APIRequest组件输入验证不当，“Save to File”功能启用时，HTTP响应Content-Disposition头中提取的文件名在与临时目录路径连接之前未被清理，可能导致攻击者通过特

CVSS 9.9 · Critical EPSS 0.56% · P45

Affected Version Matrix 1

VendorProduct Version RangeStatus
IBM Langflow OSS 1.0.0≤ 1.10.0 affected
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I. Basic Information for CVE-2026-8859

Vulnerability Information
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Vulnerability Title
Path Traversal in APIRequest Component via Content-Disposition Header
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
IBM Langflow OSS 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
IBM Langflow OSS是美国IBM公司的一个开源的低代码可视化AI工作流构建工具，它让开发者能通过拖拽组件的方式快速搭建、部署和迭代AI智能体与RAG应用，同时支持用Python进行深度定制以集成企业系统。 IBM Langflow OSS 1.0.0版本至1.10.0版本存在路径遍历漏洞，该漏洞源于APIRequest组件输入验证不当，“Save to File”功能启用时，HTTP响应Content-Disposition头中提取的文件名在与临时目录路径连接之前未被清理，可能导致攻击者通过特
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
IBM Langflow OSS 1.0.0 ~ 1.10.0 cpe:2.3:a:ibm:langflow_oss:1.0.0:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-8859

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III. Intelligence Information for CVE-2026-8859

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Vendor Advisories for CVE-2026-8859 (1)

Same Patch Batch · IBM · 2026-07-17 · 34 CVEs total

CVE-2026-9135 9.9 CRITICAL Policies Component Dynamic CodeInput Fields Bypass Custom Component Validation
CVE-2026-8635 9.9 CRITICAL Arbitrary Code Execution in Python Interpreter Component
CVE-2026-8481 9.9 CRITICAL Remote Code Execution via Code Validation Endpoint
CVE-2026-8476 9.9 CRITICAL Disk Cache Deserialization Remote Code Execution Vulnerability
CVE-2026-13446 9.8 CRITICAL Langflow is affected by remote code execution, denial of service, path traversal, and expo
CVE-2026-9202 9.8 CRITICAL Unauthenticated User Registration Could Lead to Remote Code Execution
CVE-2026-9198 9.8 CRITICAL Unauthenticated Remote Code Execution via Auto-Login Bypass and Code Validation
CVE-2026-9103 9.8 CRITICAL Unauthenticated Superuser Token Issuance via Auto-Login Endpoint
CVE-2026-8505 9.8 CRITICAL Authentication Bypass in Webhook Endpoints Allowed Unauthorized Flow Execution
CVE-2026-15091 9.3 CRITICAL Multiple Vulnerabilities in IBM Engineering AI hub.
CVE-2026-7667 8.8 HIGH Path Traversal Vulnerability in API Request Component Content-Disposition Header Processin
CVE-2026-8056 8.8 HIGH Parameter Injection Vulnerability in API Graph Execution Engine
CVE-2026-7755 8.8 HIGH MCP Server Configuration Validator Bypass via File Upload API
CVE-2026-14499 8.8 HIGH Langflow is affected by remote code execution, denial of service, path traversal, and expo
CVE-2026-13445 8.1 HIGH Langflow is affected by remote code execution, denial of service, path traversal, and expo
CVE-2026-13448 8.1 HIGH Langflow is affected by remote code execution, denial of service, path traversal, and expo
CVE-2026-13473 8.1 HIGH IBM Storage Protect Client is vulnerable to Heap-Based Buffer Overflow
CVE-2026-9762 7.8 HIGH IBM® Data Server driver for JDBC and SQLJ is vulnerable to remote code execution when jdbc
CVE-2026-7754 7.7 HIGH SSRF Protection Configuration Vulnerability
CVE-2026-7872 7.5 HIGH Path Traversal Vulnerability in File Component Leading to Arbitrary File Read and Authenti

Showing top 20 of 34 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Langflow OSS
Same vendor: IBM
Same weakness: CWE-22

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