Is this vulnerability remotely exploitable over the network?

Yes. Any authenticated user who can reach the `POST /api/v2/files/` endpoint can potentially exploit the flaw remotely, subject to their permissions and the deployment's network exposure.

Does exploitation require elevated privileges or special roles?

It requires authenticated access with the ability to upload files. Additional privileges are not necessarily needed if the upload capability is broadly available, but the impact depends on what the Langflow process can write to on the host.

What is the safest general fix pattern for developers?

Centralize file path validation and containment within the storage service, ensuring it canonicalizes paths, enforces a fixed storage root, and ignores or rewrites client-supplied filenames into safe server-generated identifiers. The storage layer should never assume that upstream validation is sufficient.

Severity:

CRITICAL RISK

(9.9)

Arbitrary File Write via External File Name Control (CWE-22/CWE-73) in Langflow LocalStorageService

CVE-2026-33309

Published:

Mar 24, 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:

Path Traversal / External Control of File Name

CWE:

CWE-22;CWE-73;CWE-94;CWE-284

Impact:

Arbitrary File Write leading to Remote Code Execution

Severity:

CRITICAL RISK

(9.9)

CVSS Version:

3.1

Vulnerability Type

Category:

Path Traversal / External Control of File Name

CWE:

CWE-22;CWE-73;CWE-94;CWE-284

Impact:

Arbitrary File Write leading to Remote Code Execution

Severity:

CRITICAL RISK

(9.9)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

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Arbitrary File Write via External File Name Control (CWE-22/CWE-73) in Langflow LocalStorageService

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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