CVE-2026-86793: Sglang

Critical severity, CVSS 9.8. EPSS: 0.8% chance of exploitation in the next 30 days.

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.

Affected products

• Sglang Sglang: up to and including 0.5.18

Published 2026-09-11. Last modified 2026-09-14.