Security Bulletin: Langflow OSS is affected by arbitrary code execution in custom component validation and trusted code enforcement

Summary Langflow OSS supports custom Python components and validation of component code for component development workflows. Weaknesses in custom component execution paths, validation endpoints, and trusted template enforcement could allow authenticated users to execute arbitrary Python code or...

Security Bulletin: Unauthenticated Session History Access via Public Flow Execution

Summary A session ID namespace bypass vulnerability existed in Langflow OSS' POST /api/v1/buildpublictmp/flowid/flow endpoint that allowed unauthenticated attackers to access chat history from other users' sessions. The endpoint accepted an inputs.session parameter that could override the session...

Critical Langflow Flaw CVE-2026-33017 Triggers Attacks within 20 Hours of Disclosure

A critical security flaw impacting Langflow has come under active exploitation within 20 hours of public disclosure, highlighting the speed at which threat actors weaponize newly published vulnerabilities. The security defect, tracked as CVE-2026-33017 CVSS score: 9.3, is a case of missing...

CVE-2026-33017

Langflow CVE-2026-33017 describes unauthenticated remote code execution via the public build endpoint /api/v1/build_public_tmp/{flow_id}/flow on versions before 1.9.0. Attackers can supply attacker-controlled flow data containing arbitrary Python code; the flow build path passes this data into th...