---
id: CVE-2026-86793
title: >-
  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…
summary: >-
  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…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-94
vendor: SGLang
product: SGLang
affected:
  - SGLang <= 0.5.18
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T19:17:51.950'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86793'
references:
  - url: 'https://github.com/sgl-project/sglang/tree/main'
    label: cret@cert.org
  - url: >-
      https://vicone.com/blog/cve-2026-86793-sglang-bypass-could-let-attackers-run-code-on-ai-servers/
    label: cret@cert.org
  - url: >-
      https://vicone.com/blog/cve-2026-86793-sglang-bypass-could-let-attackers-run-code-on-ai-servers/
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.0077
epssPercentile: 0.53662
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-14T18:51:37.042701Z'
ingestedAt: '2026-09-11T16:45:47.860Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.