CVE-2026-33017Langflow has Unauthenticated Remote Code Execution via Public Flow Build Endpoint
Updated under an hour ago ()
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It affects langflow-ai langflow and 1 other product. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Mar 25, 2026; federal agencies had to remediate by Apr 8, 2026. Treat that date as your deadline.
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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.
- CVSS
- 9.3 CRITICAL (v4.0, CNA)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
- Weakness (CWE)
- CWE-94, CWE-95, CWE-306
- Known exploited
- Added to CISA KEV Mar 25, 2026; federal remediation due Apr 8, 2026Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- EPSS (exploitation in the next 30 days)
- 24.75% (percentile 98)
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- May 21, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
langflow-ai langflow langflow_ai:langflow (from the name) | before 1.9.0 | CNA record |
langflow langflow langflow:langflow | before 1.8.2 | NVD |
References
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-vwmf-pq79-vjvxx-refsource-confirm, exploit, mitigation, vendor-advisory
- https://github.com/langflow-ai/langflow/commit/73b6612e3ef25fdae0a752d75b0fabd47328d4f0x-refsource-misc, patch
- https://github.com/advisories/GHSA-rvqx-wpfh-mfx7x-refsource-misc, third-party-advisory
- https://github.com/langflow-ai/langflow/releases/tag/1.8.2release-notes
- https://medium.com/@aviral23/cve-2026-33017-how-i-found-an-unauthenticated-rce-in-langflow-by-reading-the-code-they-already-dc96cdce5896exploit, third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-33017us-government-resource
- https://www.sysdig.com/blog/cve-2026-33017-how-attackers-compromised-langflow-ai-pipelines-in-20-hourspress/media-coverage
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.