Critical ChromaDB Vulnerability Enables Remote Code Execution

A critical vulnerability, CVE-2026-45829, in ChromaDB allows unauthenticated attackers to execute arbitrary code on exposed servers. This flaw affects the FastAPI server of the open-source vector database, which is widely used for AI-driven applications. Approximately 73% of internet-exposed ChromaDB instances are at risk, particularly those running versions 1.0.0 to 1.5.8. The vulnerability was reported on February 17, 2026, and remains unpatched as of the latest version 1.5.8. Attackers can exploit the flaw by sending crafted requests that load malicious models from Hugging Face before authentication checks are performed. Users are advised to restrict access to the API or use the Rust front-end to mitigate risks. The issue has not been addressed despite multiple attempts by researchers to contact the developers for a fix.

Key Points: • CVE-2026-45829 allows remote code execution on ChromaDB servers without authentication. • 73% of exposed ChromaDB instances are vulnerable, particularly versions 1.0.0 to 1.5.8. • Users are advised to restrict API access or switch to the Rust front-end to mitigate risks.