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CVE-2026-86793 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:9.8 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CNA: CISA-ADPCVSS-B:9.8 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://vicone.com/blog/cve-2026-86793-sglang-bypass-could-let-attackers-run-code-on-ai-servers/	CISA-ADP	AdvisoryRemedyTechnical Analysis
https://github.com/sgl-project/sglang/tree/main	[email protected]	Source CodeVendor
https://vicone.com/blog/cve-2026-86793-sglang-bypass-could-let-attackers-run-code-on-ai-servers/	[email protected]	AdvisoryRemedyTechnical Analysis

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-94	Improper Control of Generation of Code ('Code Injection')	CISA-ADP

Affected Products

Product	Versions
SGLang	<= 0.5.14 (semver)
CPE No CPEs found in CPE dictionary for this product. Remediation Workaround:low effort Configure authentication for the SGLang server to prevent unauthenticated access to the /update_weights_from_tensor endpoint. Mitigation:low effort Restrict access to the /update_weights_from_tensor endpoint to trusted networks.

Change History

2 change records found show changes

Date	Action	Recorded By
Sep 14, 2026	CVE Modified	CISA-ADP
Sep 11, 2026	New CVE Received	[email protected]