cve recordcriticalexploited in the wild

CVE-2026-33017

Langflow · Langflow · Langflow Code Injection Vulnerability

Published Mar 20, 2026 · Added to CISA KEV Mar 25, 2026

CVSS9.8

Severitycritical

WeaknessCWE-94

ExploitedYes, in CISA KEV

Ransomware useUnknown

Federal fix dueApr 8, 2026

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

Langflow is a tool for building and deploying AI-powered agents and workflows. In versions prior to 1.9.0, the POST /api/v1/build_public_tmp/{flow_id}/flow endpoint allows building public flows without requiring authentication. When the optional data parameter is supplied, the endpoint uses attacker-controlled flow data (containing arbitrary Python code in node definitions) instead of the stored flow data from the database. This code is passed to exec() with zero sandboxing, resulting in unauthenticated remote code execution. This is distinct from CVE-2025-3248, which fixed /api/v1/validate/code by adding authentication. The build_public_tmp endpoint is designed to be unauthenticated (for pu

Required action (CISA)

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

References

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Our coverage of CVE-2026-33017

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