CVE-2026-86793 CVE-2026-86793
Unauthenticated pickle deserialization in SGLang allows remote code execution when authentication keys are not configured.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-86793?
CVE-2026-86793 is a critical unsafe deserialization vulnerability in SGLang, published on 11 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
SGLang allows unauthenticated pickle deserialization through /update_weights_from_tensor when no auth keys are configured, and the SafeUnpickler policy can be bypassed because builtins.import and builtins.getattr are resolvable, enabling code execution via pickle REDUCE.
Weakness: CWE-94
Which versions are affected by CVE-2026-86793?
How do I fix CVE-2026-86793?
Apply the vendor's patch.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-86793 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86793 exists.
Sources
Also known as GHSA-m675-99qc-9233.