CVE-2026-86793

Summary

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 Software

Weaknesses

• CWE-94 Improper Control of Generation of Code ('Code Injection')

References

• https://vicone.com/blog/cve-2026-86793-sglang-bypass-could-let-attackers-run-code-on-ai-servers/
• https://github.com/sgl-project/sglang/tree/main

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