Executive Summary
VulnCheck says unpatched Langflow path traversal CVE-2026-5027 (CVSS 8.8) is exploited for unauthenticated RCE.
What Happened
A high-severity unpatched security flaw in Langflow, an open-source low-code platform to build artificial intelligence (AI) applications, has come under active exploitation in the wild, according to findings from VulnCheck. The vulnerability in question is CVE-2026-5027 (CVSS score: 8.8), a case of path traversal that could allow an attacker to write files to arbitrary locations. "The 'POST /
Affected Products
- Langflow
Vulnerability / Attack Technique
Unauthenticated file write to RCE
Technical Mechanism
Path traversal in an upload endpoint.
AI Security Category
LLM03:2025 Supply Chain
Part of the AI Supply Chain and AI SBOM topic.
Relevant Frameworks
RealGround Analysis
Unpatched AI builders must be isolated.
Recommended Controls
- Remove Langflow from internet exposure
Related RealGround Service
AI Agent SBOM and LLM Mapping · or start with the free AI Agent Security Scanner.
Sources
thehackernews.com: https://thehackernews.com/2026/06/unpatched-langflow-flaw-cve-2026-5027.html
Summary and analysis written by RealGround from the source above; last updated 2026-10-18.