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CVE-2026-92972— SGLang through 0.5.19 Unauthenticated Route Poisoning via PUT endpoint

Quick assessment

Affected
sgl-project sglang
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SGLang 在 0.5.19 及更早版本中，当启用 prefill/decode 分离模式时，其 prefill 引导服务（bootstrap service）中存在一个未认证的 端点。攻击者可以利用该漏洞污染 KV 缓存传输的路由表。通过提供任意的 和 值，攻击者可以将 decode 工作进程重定向到由攻击者控制的端点，从而导致拒绝服务（DoS）或泄露 KV 缓存传输相关的元数据，例如会话标识符和 tensor-parallel（张量并行）拓扑参数。

CVSS 8.6 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-92972

Vulnerability Information
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Vulnerability Title
SGLang through 0.5.19 Unauthenticated Route Poisoning via PUT endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
sgl-project sglang 0 ~ 0.5.19 -

II. Public POCs for CVE-2026-92972

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III. Intelligence Information for CVE-2026-92972

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Vendor Advisories for CVE-2026-92972 (2)

Other References for CVE-2026-92972 (1)

IV. Related Vulnerabilities

Same product: sglang
Same vendor: sgl-project
Same weakness: CWE-306

V. Comments for CVE-2026-92972

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