---
title: "CVE-2026-86793: SGLang - Insecure Deserialization"
description: "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."
url: https://panop.io/threat-heartbeat/CVE-2026-86793/
---

# 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 ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-86793)

## 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](https://cwe.mitre.org/data/definitions/94.html)

## 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

- [https://nvd.nist.gov/vuln/detail/CVE-2026-86793](https://nvd.nist.gov/vuln/detail/CVE-2026-86793)
- [https://github.com/sgl-project/sglang/tree/main](https://github.com/sgl-project/sglang/tree/main)
- [https://vicone.com/blog/cve-2026-86793-sglang-bypass-could-let-attackers-run-code-on-ai-servers/](https://vicone.com/blog/cve-2026-86793-sglang-bypass-could-let-attackers-run-code-on-ai-servers/)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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