SGLang through 0.5.22 SSRF via bootstrap_host and bootstrap_port on Decode Worker

Advisories

SGLang through 0.5.22 SSRF via bootstrap_host and bootstrap_port on Decode Worker

Severity: medium
Date: 10/19/2026
Affecting: sglang <= 0.5.22
CVE: CVE-2026-112267
CWE: CWE-918 Server-Side Request Forgery (SSRF)
CVSS: 6.9
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
References: https://github.com/sgl-project/sglang/issues/45008
https://github.com/sgl-project/sglang/blob/v0.5.22/python/sglang/srt/disaggregation/common/conn.py#L1157-L1181
https://github.com/sgl-project/sglang/blob/v0.5.22/python/sglang/srt/disaggregation/decode.py#L1150-L1175
Credit: Mingkai Yu, Qiang Fu, Jiadai Wang, Jiajia Liu
Description: SGLang through 0.5.22 in prefill/decode disaggregation mode contains a server-side request forgery vulnerability that allows unauthenticated attackers to trigger outbound requests via client-supplied bootstrap_host and bootstrap_port fields. Attackers sending crafted requests to the Decode worker's /generate endpoint can probe internal hosts and ports and block the shared scheduler loop, delaying other inference requests.

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