CVE-2026-15978 — HIGH (7.5)

Q: How severe is CVE-2026-15978?

CVE-2026-15978 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-15978?

Check the references section above for vendor advisories and patch information. Affected products include: Lmsys Sglang.

Vulnerability Description

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.

CVSS Score

7.5

HIGH

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

NONE

Availability

NONE

Affected Products

Vendor	Product	Versions
Lmsys	Sglang	<= 0.5.15

Related Weaknesses (CWE)

CWE-306

References

https://github.com/sgl-project/sglang/security/advisories/GHSA-cpqq-22v3-2wfmBroken Link
https://thoughts.apoorvdayal.com/posts/sglang-disclosures/Third Party AdvisoryMitigation
https://thoughts.apoorvdayal.com/posts/sglang-disclosures/Third Party AdvisoryMitigation

FAQ

What is CVE-2026-15978?

CVE-2026-15978 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 u...

How severe is CVE-2026-15978?

CVE-2026-15978 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-15978?

Check the references section above for vendor advisories and patch information. Affected products include: Lmsys Sglang.