--- title: "CVE-2026-33017: Langflow has Unauthenticated Remote Code… | CubePath" description: "Langflow is a tool for building and deploying AI-powered agents and workflows. In versions prior to 1.9.0, the POST…" language: en source: https://cubepath.com/security/cve/CVE-2026-33017 --- # CVE-2026-33017: Langflow has Unauthenticated Remote Code… | CubePath ## 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. Official description from the CVE record, published by GitHub\_M. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-33017) ## Key data ### CVSS 4.0 Critical 9.3 Score published by GitHub\_M in the CVE record. 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 | Metric | Value | What it means | | ----------------------------------- | ------- | --------------------------------------------------------------------------------------------------------------- | | Attack vector | Network | The vulnerable component can be reached over a network, possibly from the Internet. | | Attack complexity | Low | No measurable action is needed to get around the system's built-in security controls. The attack is repeatable. | | Attack requirements | None | The attack works without any special deployment or execution conditions. | | Privileges required | None | No account or privileges are needed. | | User interaction | None | No action from any user is needed. | | Vulnerable system: confidentiality | High | Serious or total effect on the secrecy of data. | | Vulnerable system: integrity | High | Serious or total effect on the trustworthiness of data. | | Vulnerable system: availability | High | Serious or total effect on availability. | | Subsequent systems: confidentiality | Low | Limited effect on other systems' data secrecy. | | Subsequent systems: integrity | Low | Limited effect on other systems' data trustworthiness. | | Subsequent systems: availability | Low | Limited effect on other systems' availability. | CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) . ### EPSS Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days. Score 0.96350 (96.4% probability) Percentile 99.9% Scores of Nov 10, 2026 Model v2026.06.15 ### CISA Known Exploited Vulnerabilities This CVE is listed in the CISA KEV catalog. Name in the catalog Langflow Code Injection Vulnerability Added to the catalog Mar 25, 2026 Federal due date Apr 8, 2026 ### CISA assessment as of Mar 26, 2026 Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA. Exploitation Recorded by CISA as active Automatable yes Technical impact total ### Weakness (CWE) CWE catalog version 5.0. CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license. - [CWE-94](https://cwe.mitre.org/data/definitions/94.html) Improper Control of Generation of Code - [CWE-95](https://cwe.mitre.org/data/definitions/95.html) Improper Neutralization of Directives in Dynamically Evaluated Code - [CWE-306](https://cwe.mitre.org/data/definitions/306.html) Missing Authentication for Critical Functionality ## Affected products Products listed in the CVE record, as the CNA published them. - langflow-ai langflow - affected: < 1.9.0 ## References Links listed in the CVE record. They lead to other sites, which CubePath does not control. - [github.com/langflow-ai/langflow/security/advisories/GHSA-vw…](https://github.com/langflow-ai/langflow/security/advisories/GHSA-vwmf-pq79-vjvx) - [github.com/langflow-ai/langflow/commit/73b6612e3ef25fdae0a7…](https://github.com/langflow-ai/langflow/commit/73b6612e3ef25fdae0a752d75b0fabd47328d4f0) - [github.com/advisories/GHSA-rvqx-wpfh-mfx7](https://github.com/advisories/GHSA-rvqx-wpfh-mfx7) ## Timeline 1. ID reserved Mar 17, 2026 2. Record published Mar 20, 2026 3. Added to CISA KEV Mar 25, 2026 4. Record last updated May 21, 2026 ## Look up another CVE ## About CubePath CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection. [Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection) Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 20:02 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)