CVE-2026-86793

SGLang allows unauthenticated pickle deserialization through /update_weights_from_tensor when no auth keys are configured, and the SafeUnpickler policy can be bypassed because builtins.import and builtins.getattr are resolvable, enabling code execution via pickle REDUCE.

  • Published Sep 11, 2026
  • CVSS 9.8 critical
  • 0.8% chance of exploitation in the next 30 days (EPSS)

Affected software

CVE-2026-86793 at the National Vulnerability Database