CVE-2026-92972

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.

CVSS v3 8.6 HIGH

8.6^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 4.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
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#L1736-L1810
https://github.com/sgl-project/sglang/issues/39400
https://www.vulncheck.com/advisories/sglang-through-0.5.19-unauthenticated-route-poisoning-via-put-endpoint

Configurations

No configuration.

History

17 Sep 2026, 14:18

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-17 14:18

Updated : 2026-09-17 14:18

NVD link : CVE-2026-92972

Mitre link : CVE-2026-92972

CVE.ORG link : CVE-2026-92972

JSON object : View

Products Affected

No product.

CWE

CWE-306

Missing Authentication for Critical Function

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