Multiple Critical Vulnerabilities in Langflow Enable Remote Code Execution

IBM disclosed three severe vulnerabilities in the open-source Langflow project on August 24, 2026. The flaws affect server instances and allow attackers to execute arbitrary code under specific conditions. CVE-2026-19286 is a code injection issue in the Agent-to-Agent (A2A) public endpoint that bypasses existing restrictions when authentication is disabled. CVE-2026-19295 permits authenticated users to evade custom component restrictions via eval injection in flow templates, leading to OS-level command execution. CVE-2026-18729 stems from insufficient input validation and lets low-privileged authenticated users bypass protected paths to run arbitrary code on the server. Patches addressing all three issues are now available.

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IBM has published a security advisory detailing multiple critical vulnerabilities in the open-source Langflow project that can be exploited to execute arbitrary code on affected servers.

The advisory, released on August 24, 2026, covers three distinct flaws. CVE-2026-19286 is a code injection vulnerability in the Agent-to-Agent (A2A) public endpoint. The restriction mechanism intended to prevent code execution is not properly implemented, allowing remote attackers to run arbitrary code when A2A is enabled and an agent flow is exposed without requiring authentication.

CVE-2026-19295 affects the evaluation process in flow templates and constitutes an eval injection flaw. An authenticated user can bypass the setting that disables custom components, escalate privileges, and execute arbitrary operating-system-level commands.

The third issue, CVE-2026-18729, results from inadequate control over code generation. Low-privileged authenticated users can circumvent protected input paths and execute arbitrary code directly on the Langflow server.

Updated versions containing fixes for all three vulnerabilities have been released and users are advised to apply the patches immediately.

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