CVE-2026-15978

7.5 highEPSS 0.5%

High (7.5) in lmsys sglang. 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.

Severity

CVSS 3.1

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 43% of CVEs (scores of 2026-10-31)
CWE: CWE-306
Published: 2026-07-30
Modified: 2026-08-04
Record from: the NVD, synced 2026-10-19

Affected

lmsys:sglang

References

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

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