---
id: CVE-2026-92972
title: >-
  SGLang through 0.5.19 in prefill/decode disaggregation mode contains an
  unauthenticated PUT /route endpoint on the prefill bootstrap service that
  allows attackers to poison the KV transfer routing table
summary: >-
  SGLang through 0.5.19 in prefill/decode disaggregation mode contains an
  unauthenticated PUT /route endpoint on the prefill bootstrap service that
  allows attackers to poison the KV transfer routing table. Attackers can supply
  arbitrary ra…
severity: high
cvss: 8.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H'
cwe:
  - CWE-306
vendor: sgl-project
product: sglang
affected:
  - sglang <= 0.5.19
published: '2026-09-17'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T20:43:58.793'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92972'
references:
  - url: 'https://github.com/sgl-project/sglang'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/disaggregation/common/conn.py#L1716-L1718
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/disaggregation/common/conn.py#L1736-L1810
    label: disclosure@vulncheck.com
  - url: 'https://github.com/sgl-project/sglang/issues/39400'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/sglang-through-0.5.19-unauthenticated-route-poisoning-via-put-endpoint
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
epss: 0.00332
epssPercentile: 0.26585
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-17T19:15:50.626497Z'
ingestedAt: '2026-09-17T14:19:30.994Z'
---

## Overview

SGLang through 0.5.19 in prefill/decode disaggregation mode contains an unauthenticated PUT /route endpoint on the prefill bootstrap service that allows attackers to poison the KV transfer routing table. Attackers can supply arbitrary rank_ip and rank_port values to redirect decode workers to attacker-controlled endpoints, causing denial of service or disclosure of KV transfer metadata including session identifiers and tensor-parallel topology parameters.

## Remediation

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