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Critical severity9.8CISA KEVNVD Advisory· Published Mar 20, 2026· Updated Jun 17, 2026

CVE-2026-33017

CVE-2026-33017

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 public flows) but incorrectly accepts attacker-supplied flow data containing arbitrary executable code. This issue has been fixed in version 1.9.0.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
langflowPyPI
< 1.9.01.9.0

Affected products

3
  • Langflow AI/Langflow2 versions
    cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*range: <1.8.2
    • (no CPE)range: < 1.9.0
  • ghsa-coords
    pkg:pypi/langflow
    Range: <= 1.8.2

Patches

Vulnerability mechanics

References

12

News mentions

23