---
title: "CVE-2026-92972: SGLang - Broken Access Control"
description: "SGLang through 0.5.19 contains an insecure endpoint in prefill bootstrap service allowing unauthenticated attackers to poison KV transfer routing table by supplying arbitrary rank_ip and rank_port, causing denial of service or information disclosure."
url: https://panop.io/threat-heartbeat/CVE-2026-92972/
---

# CVE-2026-92972 SGLang - Broken Access Control

SGLang through 0.5.19 contains an insecure endpoint in prefill bootstrap service allowing unauthenticated attackers to poison KV transfer routing table by supplying arbitrary rank\_ip and rank\_port, causing denial of service or information disclosure.

CVSS base score 8.6 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.47% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-92972)

## Details

Type

Broken Access Control

Impact

Denial Of Service, Information Disclosure

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Published

17 September 2026

Updated

15 October 2026

Weakness

[CWE-306](https://cwe.mitre.org/data/definitions/306.html)

## Vendor fix

Update to the latest version beyond 0.5.19.

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-2026-92972](https://nvd.nist.gov/vuln/detail/CVE-2026-92972)
- [https://www.vulncheck.com/advisories/sglang-through-0.5.19-unauthenticated-route-poisoning-via-put-endpoint](https://www.vulncheck.com/advisories/sglang-through-0.5.19-unauthenticated-route-poisoning-via-put-endpoint)
- [https://github.com/sgl-project/sglang](https://github.com/sgl-project/sglang)
- [https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/disaggregation/common/conn.py#L1716-L1718](https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/disaggregation/common/conn.py#L1716-L1718)
- [https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/disaggregation/common/conn.py#L1736-L1810](https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/disaggregation/common/conn.py#L1736-L1810)
- [https://github.com/sgl-project/sglang/issues/39400](https://github.com/sgl-project/sglang/issues/39400)

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## 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

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