Critical severity · published Sep 11, 2026
CVE-2026-86793
No description published yet
9.8
CVSS
0.8%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 56% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SG
SGLang · SGLang
through 0.5.18 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-86793
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-86793
github.com
https://github.com/sgl-project/sglang/tree/main
vicone.com
https://vicone.com/blog/cve-2026-86793-sglang-bypass-could-let-attackers-run-code-on-ai-servers/
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