Advisory details:
vulnrichment / CVE-2026-33017
| Advisory ID | vulnrichment/CVE-2026-33017 |
| Aliases | |
| Summary | 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. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 0.0 |
| Risk | |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| System | Score | Found at |
|---|---|---|
| cvssv4 | 9.3 | |
| ssvc | Act |
| Reference id | Reference type | URL |
|---|---|---|
| 73b6612e3ef25fdae0a752d75b0fabd47328d4f0 | Other | https://github.com/langflow-ai/langflow/commit/73b6612e3ef25fdae0a752d75b0fabd47328d4f0 |
| GHSA-rvqx-wpfh-mfx7 | https://github.com/advisories/GHSA-rvqx-wpfh-mfx7 | |
| GHSA-vwmf-pq79-vjvx | Other | https://github.com/langflow-ai/langflow/security/advisories/GHSA-vwmf-pq79-vjvx |
| Data source | Metasploit |
|---|---|
| Description | Langflow versions prior to 1.9.0 are susceptible to unauthenticated remote code execution through the /api/v1/build_public_tmp/<flow_id>/flow endpoint. A remote and unauthenticated attacker can send crafted HTTP requests to execute arbitrary code. |
| Note | Stability: - crash-safe SideEffects: - artifacts-on-disk - ioc-in-logs Reliability: - repeatable-session |
| Ransomware campaign use | Unknown |
| Source publication date | March 20, 2026 |
| Platform | Python |
| Source URL | https://github.com/rapid7/metasploit-framework/tree/master/modules/exploits/multi/http/langflow_unauth_rce_cve_2026_33017.rb |
| Data source | Exploit-DB |
|---|---|
| Date added | July 8, 2026 |
| Description | Langflow 1.9.0 - RCE |
| Ransomware campaign use | Unknown |
| Source publication date | July 8, 2026 |
| Exploit type | webapps |
| Platform | multiple |
| Source update date | July 8, 2026 |
| Data source | KEV |
|---|---|
| Date added | March 25, 2026 |
| Description | Langflow contains a code injection vulnerability that could allow building public flows without requiring authentication. |
| 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. |
| Due date | April 8, 2026 |
| Note | https://github.com/langflow-ai/langflow/security/advisories/GHSA-vwmf-pq79-vjvx ; https://nvd.nist.gov/vuln/detail/CVE-2026-33017 |
| Ransomware campaign use | Unknown |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Attack Requirements (AT) | Privileges Required (PR) | User Interaction (UI) | Vulnerable System Impact Confidentiality (VC) | Vulnerable System Impact Integrity (VI) | Vulnerable System Impact Availability (VA) | Subsequent System Impact Confidentiality (SC) | Subsequent System Impact Integrity (SI) | Subsequent System Impact Availability (SA) |
|---|---|---|---|---|---|---|---|---|---|---|
network adjacent local physical |
low high |
none present |
none low high |
none passive active |
high low none |
high low none |
high low none |
high low none |
high low none |
high low none |
Vector: SSVCv2/E:A/A:Y/T:T/P:M/B:A/M:M/D:C/2026-03-26T03:55:25Z/
Decision: Act
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/33xxx/CVE-2026-33017.json
Source Advisory: vulnrichment/CVE-2026-33017
[{'Exploitation': 'active'},
{'Automatable': 'yes'},
{'Technical Impact': 'total'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]