CVE-2026-15978

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.

Score

CVSS 3.1 7.5 High

Status

Analyzed - cret@cert.org

Published

2026-07-30

Last modified

2026-07-31

Weaknesses

CWE-306

Affected products

• Sglang (Lmsys)
• Sglang (Sglang)

References

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