What is CVE-2026-33017?

CVE-2026-33017 is a critical-severity vulnerability in Langflow, classified under Code Injection. CVSS score: 9.8/10. Published 2026-03-20.

How severe is CVE-2026-33017?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2026-33017 known to be exploited?

Yes. CVE-2026-33017 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-03-25), indicating it is being actively exploited. 11 public proof-of-concept repositories are indexed.

RCE in Langflow

CVE-2026-33017

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 op…

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.240 (96.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Langflow
Langflow-ai Langflow — versions < 1.9.0

Weakness classification (CWE)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2026-03-25. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2026-04-08.

Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Public proof-of-concept exploits

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)
security-advisories@github.com (Third Party Advisory, x_refsource_MISC)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (Release Notes)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (Exploit, Third Party Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (Press/Media Coverage)

Frequently asked questions

What is CVE-2026-33017?: CVE-2026-33017 is a critical-severity vulnerability in Langflow, classified under Code Injection. CVSS score: 9.8/10. Published 2026-03-20.
How severe is CVE-2026-33017?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2026-33017 known to be exploited?: Yes. CVE-2026-33017 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-03-25), indicating it is being actively exploited. 11 public proof-of-concept repositories are indexed.