EUVD-2026-38517

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.2, an Insecure Direct Object Reference IDOR vulnerability in /api/v1/responses endpoint allows an authenticated attacker to execute any flow belonging to another user by specifying the victim's flow ID in...

CVE-2026-55255 Langflow: IDOR Vulnerability in `/api/v1/responses` Endpoint Allows Authenticated Attackers to Access Another User's Flow

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.2, an Insecure Direct Object Reference IDOR vulnerability in /api/v1/responses endpoint allows an authenticated attacker to execute any flow belonging to another user by specifying the victim's flow ID in...

CVE-2026-55255

Langflow4: CVE-2026-55255 describes an IDOR in POST /api/v1/responses that lets an authenticated user execute another user’s flow by supplying the victim’s flow ID. Root cause: get_flow_by_id_or_endpoint_name queries by UUID without verifying ownership in both UUID and endpoint_name paths, enabli...

CVE-2026-55423

CVE-2026-55423 affects Langflow prior to version 1.7.0, where the /logout flow fails to clear session data. Root cause: the logout endpoint did not delete cookies with matching attributes (httponly/samesite/secure/domain), so tokens persisted in local storage and cookies even after logout. Conseq...

CVE-2026-55423 Langflow: Logout button does not clear session

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.7.0, the logout button does not clear the session. The previous user stays logged in unless another user explicitly logs in. This vulnerability is fixed in 1.7.0...

CVE-2026-55446

Langflow before version 1.0.19 is vulnerable to unauthenticated DoS on the /api/v1/files/upload/ endpoint by sending a multipart/form-data request with an extremely long boundary. The vulnerability allows an attacker to cause the server to become unusable for all users for an indefinite period, w...

EUVD-2026-38515

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.0.19, an attacker can send a /api/v1/files/upload/ request without any authentication token/cookies and abuse a very long multipart form boundary to make the langflow app unusable for all users for an...

CVE-2026-55446 Langflow: Unauthenticated DoS through multipart form boundary file upload

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.0.19, an attacker can send a /api/v1/files/upload/ request without any authentication token/cookies and abuse a very long multipart form boundary to make the langflow app unusable for all users for an...

CVE-2026-48519 Langflow: Unauthenticated RCE in Shareable Playgrounds

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.2, the "Shareable Playground" or "Public Flows" in code contains a critical RCE vulnerability. Shareable Playground feature works by enabling the execution of workflows by unauthenticated users, by accessi...

CVE-2026-48519

Langflow CVE-2026-48519 exposes unauthenticated RCE via the Shareable Playground. Affected: Langflow prior to 1.9.2. Vulnerable route: /api/v1/build_public_tmp permits executing any public flow; payloads can inject arbitrary Python code into data.nodes[X].data.node.template.code.value. Impact is ...

CVE-2026-55447 Langflow: BaseFileComponent-based nodes arbitrary file read with RCE exploit

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.2, by controlling a files that are digested into the RAG, an attacker can direct the node to read any file on the file-system by absolute path. All components based on BaseFileComponent are vulnerable to t...

CVE-2026-55447

Langflow’s BaseFileComponent family (including Read File, DoclingInlineComponent, DoclingServe, DoclingRemoteComponent, NvidiaIngestComponent, VideoFileComponent, UnstructuredComponent) is affected by CVE-2026-55447. The underlying issue is in base_file.py: _unpack_bundle TAR extraction does not ...

CVE-2026-55450

Langflow prior to 1.9.1 allows unauthenticated uploads via the /upload/{flow_id} endpoint, enabling unlimited data transfer, which can cause server disk-space exhaustion (DoS). The response also leaks the absolute path of the uploaded file, an information leak that could aid further attacks. The ...

Security Bulletin: SSRF via HTTP Redirect Following in Langflow API Request Component

Summary Langflow OSS contains SSRF vulnerability in API Request component allowing authenticated flow authors to read localhost/private HTTP services via redirect following. APIRequestComponent.makeapirequest validates only initial URL with validateandresolveurl and pins DNS for initial hostname,...

Security Bulletin: DNS Rebinding TOCTOU Bypass of SSRF Protection in Langflow OSS URL Component

Summary Langflow OSS contains DNS rebinding TOCTOU vulnerability bypassing SSRF protection. URL component validates URLs with validateurlforssrf but fetches via RecursiveUrlLoader performing independent DNS resolution, creating exploitable TOCTOU window. Maintainers fixed identical issue in...

Security Bulletin: Unauthenticated Server-Side RCE via PythonCodeStructuredTool in Public Flows

Summary Langflow OSS contains unauthenticated server-side RCE via PythonCodeStructuredTool executing attacker-controlled Python through exec at flow-build time. Sink in execself.toolcode, globals, localnamespace where toolcode is attacker-controlled template field. Two paths: A Authenticated POST...

CVE-2026-7664

IBM Langflow OSS 1.0.0 through 1.8.4 could allow unauthenticated attackers to access protected MCP project resources and execute MCP operations due to improper authorization enforcement in the Streamable MCP transport endpoint...

CVE-2026-10561

IBM Langflow OSS 1.0.0 through 1.9.3 has an vulnerability due to an improper isolation of Python execution combined with an authentication bypass that allows an unauthenticated attacker to execute arbitrary code on the host system, resulting in complete compromise...

EUVD-2026-38281

IBM Langflow OSS 1.0.0 through 1.8.4 could allow unauthenticated attackers to access protected MCP project resources and execute MCP operations due to improper authorization enforcement in the Streamable MCP transport endpoint...

CVE-2026-7664

IBM Langflow OSS 1.0.0 through 1.8.4 could allow unauthenticated attackers to access protected MCP project resources and execute MCP operations due to improper authorization enforcement in the Streamable MCP transport endpoint...