PoC Index85,079 CVEs with PoCs

CVE-2026-33017

Langflow has Unauthenticated Remote Code Execution via Public Flow Build Endpoint

KEVCRITICAL 9.3EPSS 24.8%

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.

Affected
langflow-ai · langflow
CVSS v4.0 GITHUB
9.3 CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v4.0 GitHub
9.3 CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:A
CVSS v3.1 NVD
9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
24.75% chance of exploitation in the next 30 days, 98th percentile
CISA KEV
added 2026-03-25
Nuclei
critical · CWE-94
Published
2026-03-20
Updated
2026-05-21

Proof-of-concept exploits (30)

Nuclei templates (1)

Metasploit modules (1)

ExploitDB entries (1)

Vulhub environments (1)

Security advisories

References

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