---
id: CVE-2026-110809
title: A security vulnerability has been detected in sgl-project SGLang up to 0.5.19
summary: >-
  A security vulnerability has been detected in sgl-project SGLang up to 0.5.19.
  Affected by this issue is the function Session.create_req of the file
  python/sglang/srt/session/session_controller.py of the component Session
  Cleanup. Such m…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-404
published: '2026-10-15'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T00:16:40.300'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-110809'
references:
  - url: >-
      https://gist.github.com/Yunzez/dbd254603fa2bc74358cb3647423d0ec#file-repro_sglang_session_replace_crash-py
    label: cna@vuldb.com
  - url: 'https://github.com/sgl-project/sglang/'
    label: cna@vuldb.com
  - url: 'https://github.com/sgl-project/sglang/issues/41470'
    label: cna@vuldb.com
  - url: 'https://github.com/sgl-project/sglang/pull/41483'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/cve/CVE-2026-110809'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/1004356'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/420279'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/420279/cti'
    label: cna@vuldb.com
tags:
  - nvd
ingestedAt: '2026-10-15T01:08:04.221Z'
---

## Overview

A security vulnerability has been detected in sgl-project SGLang up to 0.5.19. Affected by this issue is the function Session.create_req of the file python/sglang/srt/session/session_controller.py of the component Session Cleanup. Such manipulation leads to denial of service. The attack may be performed from remote. The exploit has been disclosed publicly and may be used. The pull request to fix this issue awaits acceptance.

## Remediation

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