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CVE-2026-19306— Langflow is vulnerable to arbitrary local file read due to path traversal in ChatInput, bundle FileInput, and GitExtractor components

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 版本 1.0.0 至 1.11.2 存在一个安全漏洞，允许经过身份验证的攻击者通过向已认证的构建请求中的 参数传入绝对路径或路径遍历序列，从而读取服务器文件系统中的任意文件。这些文件包括服务器敏感信息（如 、JWT 签名密钥、应用程序数据库、 以及其他租户的上传目录）。 读取到的文件内容会以文本附件的形式嵌入到大语言模型的提示词（prompt）中，并传输到配置的大模型端点，导致机密数据外泄。 此漏洞绕过了 所设定的访问限制边界——该边界原本用于限制其他文件读取组件的访问权限，但在“

CVSS 7.7 · High

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 1

VendorProduct Version RangeStatus
IBM Langflow OSS 1.0.0≤ 1.11.2 affected
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I. Basic Information for CVE-2026-19306

Vulnerability Information
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Vulnerability Title
Langflow is vulnerable to arbitrary local file read due to path traversal in ChatInput, bundle FileInput, and GitExtractor components
Source: CVE Program / CVE List V5
Vulnerability Description
IBM Langflow OSS 1.0.0 through 1.11.2 allows an authenticated attacker to read arbitrary files from the server filesystem — including server secret material (secret_key, JWT signing keys, the application database, /proc/self/environ, and other tenants' upload directories) — by supplying absolute paths or traversal sequences in the files parameter of an authenticated build request. The file contents were embedded as text attachments in the language model prompt and transmitted to the configured model endpoint, resulting in confidential data exfiltration. This bypassed the LANGFLOW_RESTRICT_LOCAL_FILE_ACCESS=true containment boundary, which was enforced for other file-reading components but not for the Chat Input to Message attachment pipeline.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
IBM Langflow OSS 1.0.0 ~ 1.11.2 cpe:2.3:a:ibm:langflow_oss:1.0.0:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-19306

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III. Intelligence Information for CVE-2026-19306

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Other References for CVE-2026-19306 (1)

Same Patch Batch · IBM · 2026-09-04 · 64 CVEs total

CVE-2026-18658 9.8 CRITICAL IBM Operational Decision Manager for Aug 2026 - Multiple CVEs addressed
CVE-2026-19274 9.6 CRITICAL IBM Instana Observability is affected by multiple vulnerabilities within Instana Agent con
CVE-2026-18486 8.8 HIGH IBM ContextForge MCP Gateway is affected by credential disclosure and privilege escalation
CVE-2026-19298 8.8 HIGH Langflow is vulnerable to remote code execution due to authorization policy bypass in the
CVE-2026-19305 8.6 HIGH Langflow is vulnerable to Server-Side Request Forgery due to missing or bypassable URL val
CVE-2026-77822 8.2 HIGH IBM ContextForge MCP Gateway is affected by server-side request forgery (DNS rebinding) vi
CVE-2026-18175 8.1 HIGH IBM i is Affected By Improper Authorization and Authentication Vulnerabilities in DDM / DR
CVE-2026-19303 8.1 HIGH Langflow is vulnerable to arbitrary file write and arbitrary file deletion due to unvalida
CVE-2026-18221 8.1 HIGH IBM i is Affected By Improper Authorization and Authentication Vulnerabilities in DDM / DR
CVE-2026-18905 7.7 HIGH IBM ContextForge MCP Gateway is affected by server-side request forgery via DNS TOCTOU at
CVE-2026-19283 7.7 HIGH IBM Instana Observability is affected by multiple vulnerabilities within Instana Agent con
CVE-2026-19304 7.7 HIGH Langflow is vulnerable to Server-Side Request Forgery due to missing or bypassable URL val
CVE-2026-81832 7.7 HIGH IBM App Connect Enterprise and IBM Integration Bus for z/OS Adapter nodes are vulnerable t
CVE-2026-19300 7.5 HIGH Langflow is vulnerable to information disclosure due to cross-user MCP tool cache collisio
CVE-2026-18489 7.4 HIGH IBM ContextForge Translate is affected by cross-client credential context confusion
CVE-2026-5522 6.7 MEDIUM QRadar contains hard-coded credentials
CVE-2026-17622 6.5 MEDIUM Langflow OSS is affected by arbitrary file read due to path traversal vulnerabilities in f
CVE-2026-14470 6.5 MEDIUM Langflow OSS is affected by arbitrary file read due to path traversal vulnerabilities in f
CVE-2026-9186 6.5 MEDIUM Langflow is vulnerable to stored cross-site scripting and IP spoofing due to unsanitized M
CVE-2026-18887 6.5 MEDIUM IBM i is Affected By Sensitive Information Exposure Vulnerability in PASE []

Showing top 20 of 64 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-19306

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