CVE-2026-33017

Aliases:GHSA-vwmf-pq79-vjvx
Modified
Published: 20 Mar 2026, 04:52
Last modified:26 Mar 2026, 03:55

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.8 CRITICAL
v3.1 (nvd)
EPSS Score
0.59% LOW
1% probability +0.23%
KEV
Listed
CISA
1 listing
Ransomware
No reports
Public exploits
2 found
Dark Web
Not detected

Timeline

20 Mar 2026, 04:52
Published
Vulnerability first disclosed
25 Mar 2026, 00:00
Added to CISA KEV
Langflow Code Injection Vulnerability
26 Mar 2026, 03:55
Last Modified
Vulnerability information updated
08 Apr 2026, 00:00
CISA Remediation Due
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

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.

CVSS Metrics

  • v4.0•CRITICAL•Score: 9.3CVSS: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
  • v4.0•CRITICAL•Score: 9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
  • v4.0•CRITICAL•Score: 9.3CVSS: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
  • v3.1•CRITICAL•Score: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.59%• Percentile: 69%

Techniques & Countermeasures

  • CWE-94•Improper Control of Generation of Code ('Code Injection')

    The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

  • CWE-95•Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')

    The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes code syntax before using the input in a dynamic evaluation call (e.g. "eval").

  • CWE-306•Missing Authentication for Critical Function

    The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

Affected Systems

  • langflow-ai•langflow

    < 1.9.0

  • Unknown•Langflow

    ≤ 1.8.2 | 1.9.0:dev0 | 1.9.0:dev1 | 1.9.0:dev10 | 1.9.0:dev11 | 1.9.0:dev2 | 1.9.0:dev3 | 1.9.0:dev4 | 1.9.0:dev5 | 1.9.0:dev6 | 1.9.0:dev7 | 1.9.0:dev8 | 1.9.0:dev9 | < 1.8.2

  • PyPI•langflow

    ≤ 1.8.1 | < 1.8.2

References (11)