CVE-2026-15978: Lmsys Sglang

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

SGLang contains a model weight exfiltration vulnerability when no API keys are configured, as SGLang will expose two endpoints that allow a remote attacker to trigger distributed weight broadcasting using NCCL and then triggering data transfer, attackers can exfiltrate all model weights.

Affected products

• Lmsys Sglang: up to and including 0.5.15

Published 2026-07-30. Last modified 2026-08-04.