How broadly exploitable is this vulnerability?

The vulnerability is exploitable by any party that can send HTTP requests to the affected `/api/v1/build_public_tmp/{flow_id}/flow` endpoint, because it does not require authentication and directly executes attacker-supplied code. If the instance is internet-exposed, the exposure is effectively global.

Does an attacker need a valid Langflow account or existing flow to exploit this?

No valid account is required, but the attacker needs a reachable Langflow instance and a target `flow_id`. In scenarios where `flow_id` values are predictable or discoverable, unauthenticated remote attackers can exploit the issue without any prior access.

What is the safest general fix pattern for this kind of issue?

The most robust fix pattern is to remove direct dynamic code execution from user-controllable inputs, apply authentication and authorization to any endpoint that can influence executable behavior or building of flows, and treat flow definitions as data rather than executable code. If code execution is a feature, it should be tightly scoped and isolated to sandboxed environments.

Severity:

CRITICAL RISK

(9.8)

Unauthenticated Dynamic Code Execution (CWE-94) in Langflow Public Flow Builder API

CVE-2026-33017

Published:

Mar 19, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Dynamic Code Execution

CWE:

CWE-94;CWE-95;CWE-306

Impact:

Unauthenticated Remote Code Execution

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

Vulnerability Type

Category:

Dynamic Code Execution

CWE:

CWE-94;CWE-95;CWE-306

Impact:

Unauthenticated Remote Code Execution

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

Unauthenticated Dynamic Code Execution (CWE-94) in Langflow Public Flow Builder API

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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