CVE-2026-15978

Summary

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 Software

Weaknesses

• CWE-306: Missing Authentication for Critical Function

References

• https://github.com/sgl-project/sglang/security/advisories/GHSA-cpqq-22v3-2wfm
• https://thoughts.apoorvdayal.com/posts/sglang-disclosures/

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