Hackers Can Exploit Ollama Model Uploads to Leak Sensitive Server Data

A critical unpatched vulnerability (CVE-2026-5757) in Ollama’s model upload/quantization engine allows unauthenticated remote attackers to exploit crafted GGUF uploads to read heap memory and exfiltrate sensitive data (encryption keys, credentials, API tokens). Discovered and disclosed by a researcher, the flaw stems from skipped bounds checking and unsafe memory operations; no vendor patch exists, so immediate mitigations (disable uploads, restrict access, accept uploads only from trusted sources) are advised.