CVE-2026-33017
9.8, critical Known exploitedLangflow Code Injection Vulnerability
- CVSS
- 9.8, critical critical CVSS v3.1
- EPSS, next 30 days
- 25% higher than 97.8% of scored CVEs
- Exploitation
- Confirmed in the wild
- Published
- 20 Mar 20267 months ago
Known exploited
CISA added this to the Known Exploited Vulnerabilities Catalog on 25 Mar 2026. US federal agencies had to remediate by 8 Apr 2026, a deadline that has passed.
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.
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.
Details
- Vendor
- Langflow
- Product
- langflow
- Weakness
- CWE-94 (opens in a new tab)
- Status
- Analyzed
- Updated
- 17 Jun 2026
- Assigner
- security-advisories@github.com
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References 7
Exploit code 2
Patches and fixes 1
Other references 3
The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.
Other Langflow CVEs
Every Langflow CVE we holdSame vendor in what we hold, not a known link between the flaws.
- CVE-2026-55255 Langflow Authorization Bypass Through User-Controlled Key Vulnerability KEV EPSS 0.9% 8.4, high
- CVE-2026-0770 Langflow Inclusion of Functionality from Untrusted Control Sphere Vulnerability KEV EPSS 63% 9.8, critical
- CVE-2025-34291 Langflow Origin Validation Error Vulnerability KEV EPSS 93% 8.8, high
- CVE-2025-3248 Langflow Missing Authentication Vulnerability KEV EPSS 100% 9.8, critical
Beyond this page
Is CVE-2026-33017 in your network?
This page tells you how dangerous CVE-2026-33017 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.
CVE-2026-33017 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.
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EXYS7600 OCELOT
Find it before attackers do
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EXYS7950 KONDRA
Detect it if it's exploited
Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.
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Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.