CVE-2026-86793 SGLang - Insecure Deserialization

SGLang contains an insecure deserialization vulnerability caused by unauthenticated pickle deserialization via /update_weights_from_tensor when no auth keys are configured, letting unauthenticated attackers execute arbitrary code remotely, exploit requires no authentication keys configured.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.77% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Insecure Deserialization
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
11 September 2026
Updated
15 October 2026
Weakness
CWE-94

Vendor fix

Configure authentication keys or update to a version that properly restricts pickle deserialization.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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