Auth bypass in Sgl-Project Sglang
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.
Vulnerability class: Broken Authentication
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H.
Affected products
Weakness classification (CWE)
References
- disclosure@vulncheck.com (issue-tracking)
- disclosure@vulncheck.com (technical-description)
- disclosure@vulncheck.com (technical-description)
- disclosure@vulncheck.com (product)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-92972?
- CVE-2026-92972 is a high-severity vulnerability in Sgl-Project Sglang, classified under Missing Authentication for Critical Function. CVSS score: 8.6/10. Published 2026-09-17.
- How severe is CVE-2026-92972?
- High severity. CVSS v3 base score is 8.6 out of 10.