CVE-2026-92972
SGLang through 0.5.19 Unauthenticated Route Poisoning via PUT endpoint
CVSS Score
8.6
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-306 |
| Vendor | sgl-project |
| Product | sglang |
| Published | Sep 17, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
High
Affected Versions
sgl-project / sglang
0 ≤ 0.5.19
References
github.com: https://github.com/sgl-project/sglang/issues/39400 github.com: https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/disaggregation/common/conn.py#L1736-L1810 github.com: https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/disaggregation/common/conn.py#L1716-L1718 github.com: https://github.com/sgl-project/sglang vulncheck.com: https://www.vulncheck.com/advisories/sglang-through-0.5.19-unauthenticated-route-poisoning-via-put-endpoint
Credits
Jiapeng Li Jiajia Liu Tongchun Xiao