CVE-2026-92972
SGLang through 0.5.19 Unauthenticated Route Poisoning via PUT endpoint
- State
- Published
- Severity
- 8.8 High
- Published
- Sep 17, 2026
- Updated
- Sep 18, 2026
- Reserved
- Sep 17, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.8 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 8.6 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H | VulnCheck |
Weaknesses
- CWE-306 Missing Authentication for Critical Function
Affected Products
| Product | Versions |
|---|---|
sglangsgl-project |
|
References
- GitHub Issue #39400issue-tracking
- https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/disaggregation/common/conn.py#L1736-L1810technical-description
- https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/disaggregation/common/conn.py#L1716-L1718technical-description
- https://github.com/sgl-project/sglangproduct
- VulnCheck Advisory: SGLang through 0.5.19 Unauthenticated Route Poisoning via PUT endpointthird-party-advisory
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