CVE-2026-15978 CVE-2026-15978
Attackers can exfiltrate model weights from SGLang servers if API keys are not configured, exposing sensitive AI models.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-15978?
CVE-2026-15978 is a high-severity missing authorization vulnerability in SGLang, published on 30 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-306
Which versions are affected by CVE-2026-15978?
It affects 1 product.
Products include Lmsys Sglang.
How do I fix CVE-2026-15978?
No fix has been published for CVE-2026-15978 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-15978 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-15978 exists.
Other vulnerabilities in SGLang
Sources
Also known as GHSA-cpqq-22v3-2wfm, GHSA-x6x2-r266-cx9p.