CVE-2026-33017

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.

Overview

State: PUBLISHED
Assigner (CNA): GitHub_M
CVSS severity: CRITICAL
CVSS score: 9.3 / 10
CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
Effective score: 9.3 / 10 CRITICAL source: CNA overview
CWE(s): CWE-94, CWE-95, CWE-306
Reserved: 2026-03-17
Published: 2026-03-20 04:52 UTC
Last updated: 2026-03-26 03:55 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33017.json
Linked Threat: CVE-2026-33017 — Langflow Langflow: Langflow Code Injection Vulnerability

CISA Known Exploited Vulnerabilities CISA KEV

CISA has confirmed in-the-wild exploitation of this CVE. Federal agencies must remediate by the due date below; private orgs should treat it as priority-1.

Vulnerability name: Langflow Code Injection Vulnerability
Vendor / project: Langflow
Product: Langflow
Date added to KEV: 2026-03-25
Remediation due: 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.
Ransomware campaign use: Unknown
CISA notes: https://github.com/langflow-ai/langflow/security/advisories/GHSA-vwmf-pq79-vjvx ; https://nvd.nist.gov/vuln/detail/CVE-2026-33017
CISA listing: www.cisa.gov/known-exploited-vulnerabilities-catalog

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-03-20 05:16:15 UTC
NVD last modified: 2026-05-21 21:16:31 UTC
NVD CVSS v3.1: 9.8 / 10 CRITICAL source: nvd@nist.gov
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitability subscore: 3.9 / 10
Impact subscore: 5.9 / 10
EPSS score: 0.2324 (probability of exploitation in next 30 days)
EPSS percentile: 96.02% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-13556
Assigner: GitHub_M
Published: Mar 20, 2026, 4:52:52 AM
Updated: May 21, 2026, 7:54:41 PM
EUVD base score (CVSS 4.0): 9.3 / 10
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
EUVD-reported EPSS: 23.9800
Vendors: langflow-ai
Products: langflow (< 1.9.0)
Aliases: GHSA-vwmf-pq79-vjvx

ENISA 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.

EUVD references (3)

Affected products (1)

Vendor	Product	Versions	Platforms
langflow-ai	langflow	`< 1.9.0` (affected)	—

Affected products — CPE 2.3 (1) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*

Vendor references (3)

References embedded in the original CVE record by the assigning CNA.

https://github.com/langflow-ai/langflow/security/advisories/GHSA-vwmf-pq79-vjvx x_refsource_CONFIRM
https://github.com/langflow-ai/langflow/commit/73b6612e3ef25fdae0a752d75b0fabd47328d4f0 x_refsource_MISC
https://github.com/advisories/GHSA-rvqx-wpfh-mfx7 x_refsource_MISC

MITRE references (1) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

https://github.com/advisories/GHSA-rvqx-wpfh-mfx7 x_refsource_MISC

Web references (8)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

http://cwe.mitre.org/data/definitions/94.html rapid7:cwe.mitre.org
http://cwe.mitre.org/data/definitions/95.html rapid7:cwe.mitre.org
https://attackerkb.com/topics/CVE-2026-33017 rapid7:attackerkb.com
https://github.com/langflow-ai/langflow/commit/73b6612e3ef25fdae0a752d75b0fabd47328d4f0 rapid7:github.com
https://github.com/langflow-ai/langflow/releases/tag/1.9.0 rapid7:github.com
https://github.com/langflow-ai/langflow/security/advisories/GHSA-vwmf-pq79-vjvx rapid7:github.com
http://cwe.mitre.org/data/definitions/306.html rapid7:cwe.mitre.org
https://www.cve.org/CVERecord?id=CVE-2026-33017 rapid7:www.cve.org

NVD-tagged references (7)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://github.com/advisories/GHSA-rvqx-wpfh-mfx7 security-advisories@github.com Third Party Advisory
https://github.com/langflow-ai/langflow/commit/73b6612e3ef25fdae0a752d75b0fabd47328d4f0 security-advisories@github.com Patch
https://github.com/langflow-ai/langflow/releases/tag/1.8.2 134c704f-9b21-4f2e-91b3-4a467353bcc0 Release Notes
https://github.com/langflow-ai/langflow/security/advisories/GHSA-vwmf-pq79-vjvx security-advisories@github.com ExploitMitigationVendor Advisory
https://medium.com/@aviral23/cve-2026-33017-how-i-found-an-unauthenticated-rce-in-langflow-by-reading-the-code-they-already-dc96cdce5896 134c704f-9b21-4f2e-91b3-4a467353bcc0 ExploitThird Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-33017 134c704f-9b21-4f2e-91b3-4a467353bcc0 US Government Resource
https://www.sysdig.com/blog/cve-2026-33017-how-attackers-compromised-langflow-ai-pipelines-in-20-hours 134c704f-9b21-4f2e-91b3-4a467353bcc0 Press/Media Coverage

Indicators (4)

IOCs linked to the auto-promoted Threat row.

Type	Value	VirusTotal	Attached
cwe	`CWE-306`	no local data	2026-05-14 02:58 UTC
cwe	`CWE-94`	no local data	2026-05-14 02:58 UTC
cve	`CVE-2026-33017`	no local data	2026-05-14 02:58 UTC
cwe	`CWE-95`	no local data	2026-05-14 02:58 UTC

Remediations (9)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

Patch Tuesday May 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-05-14 11:46 UTC
Security Update Guide - Loading - Microsoft

web:msrc.microsoft.com

Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure. See Acknowledgements for more information.

2026-05-14 11:46 UTC
Nvd - Cve-2026-33017

web:nvd.nist.gov

An official website of the United States government Here's how you know

2026-05-14 11:46 UTC
Security Update Guide - Microsoft

web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-05-14 11:46 UTC
Critical Langflow Flaw CVE-2026-33017 Triggers Attacks within 20 Hours ...

web:thehackernews.com

Langflow CVE-2026-33017 exploited in 20 hours after disclosure, enabling RCE via exec(), exposing systems before patching cycles.

2026-05-14 11:46 UTC
Microsoft April 2026 Patch Tuesday fixes 167 flaws, 2 zero-days

web:www.bleepingcomputer.com

Today is Microsoft's April 2026 Patch Tuesday with security updates for 167 flaws, including 2 zero-day vulnerabilities.

2026-05-14 11:46 UTC
Microsoft Patch Tuesday May 2026 - 120 Vulnerabilities Fixed, Including ...

web:cybersecuritynews.com

Microsoft's May 2026 Patch Tuesday lands with a heavy enterprise focus, fixing 120 vulnerabilities across Windows, Office, Azure, developer tools, and Microsoft 365 apps, including 29 remote code execution (RCE) flaws rated Critical.

2026-05-14 11:46 UTC
CVE-2026-33017: Langflow Langflow RCE Vulnerability - SentinelOne

web:www.sentinelone.com

CVE-2026-33017 is a remote code execution vulnerability in Langflow Langflow. Learn about its impact, affected versions, and mitigation methods.

2026-05-14 11:46 UTC
CISA Required Action

CISA KEV

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Due date: 2026-04-08 Known ransomware campaign use: Unknown

2026-05-14 01:13 UTC

AI Forensic Analysis

Only Available for Registered Users. Sign in to view.

Raw JSON

The full cvelistV5 record. Download as CVE-2026-33017.json.

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