{"id":"CVE-2026-102634","aliases":["EUVD-2026-89029","GHSA-mjgp-hgfr-77jq","openSUSE-SU-2026:11947-1"],"status":"published","title":"SGLang through 0.5.20 Denial of Service via Duplicate bootstrap_room","description":"SGLang through 0.5.20 in prefill/decode disaggregation mode fails to validate duplicate bootstrap_room fields in /generate requests with Mooncake KV transfer backend. Unauthenticated attackers can send concurrent requests with identical bootstrap_room values to crash scheduler processes or hang other users' requests until transfer timeout.","severity":{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00582,"percentile":0.48306,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-694"],"published":"2026-09-29T16:04:17Z","modified":"2026-10-28T02:30:45Z","fixes":[{"ecosystem":"openSUSE:Tumbleweed","package":"python-sglang","fixed_in":["0.5.20-2.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"python-sglang","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.5.20-2.1"}]}]}],"products":[{"vendor":"sgl-project","product":"sglang"}],"references":[{"url":"https://github.com/sgl-project/sglang/issues/40125","tags":["issue-tracking","exploit","report"]},{"url":"https://github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregation/common/conn.py#L392-L393","tags":["technical-description","article"]},{"url":"https://github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregation/mooncake/conn.py#L2760-L2764","tags":["technical-description","article"]},{"url":"https://github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregation/decode.py#L942","tags":["technical-description","article"]},{"url":"https://github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/managers/io_struct.py#L281","tags":["technical-description","article"]},{"url":"https://github.com/sgl-project/sglang","tags":["product","package"]},{"url":"https://www.vulncheck.com/advisories/sglang-through-0.5.20-denial-of-service-via-duplicate-bootstrap-room","tags":["third-party-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102634","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-mjgp-hgfr-77jq"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102634.json","tags":["advisory"]},{"url":"https://pypi.org/project/sglang","tags":["package"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-102634","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-102634","title":"SGLang through 0.5.20 Denial of Service via Duplicate bootstrap_room","description":"SGLang through 0.5.20 in prefill/decode disaggregation mode fails to validate duplicate bootstrap_room fields in /generate requests with Mooncake KV transfer backend. Unauthenticated attackers can send concurrent requests with identical bootstrap_room values to crash scheduler processes or hang other users' requests until transfer timeout.","status":"published","published":"2026-09-29T16:04:17.381Z","modified":"2026-09-29T17:33:09.537Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-694"],"updated_at":"2026-11-02T13:38:54.394896Z"}],"euvd":[{"id":"EUVD-2026-89029","description":"SGLang through 0.5.20 in prefill/decode disaggregation mode fails to validate duplicate bootstrap_room fields in /generate requests with Mooncake KV transfer backend. Unauthenticated attackers can send concurrent requests with identical bootstrap_room values to crash scheduler processes or hang other users' requests until transfer timeout.","status":"published","published":"2026-09-29T16:04:17Z","modified":"2026-09-29T17:33:09Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T17:27:51.524944Z"}],"ghsa":[{"id":"GHSA-mjgp-hgfr-77jq","title":"SGLang through 0.5.20 in prefill/decode disaggregation mode fails to validate duplicate...","description":"SGLang through 0.5.20 in prefill/decode disaggregation mode fails to validate duplicate bootstrap_room fields in /generate requests with Mooncake KV transfer backend. Unauthenticated attackers can send concurrent requests with identical bootstrap_room values to crash scheduler processes or hang other users' requests until transfer timeout.","status":"published","published":"2026-09-29T18:31:50Z","modified":"2026-09-29T18:31:57Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-694"],"updated_at":"2026-11-02T15:12:33.840327Z"}],"nvd":[{"id":"CVE-2026-102634","description":"SGLang through 0.5.20 in prefill/decode disaggregation mode fails to validate duplicate bootstrap_room fields in /generate requests with Mooncake KV transfer backend. Unauthenticated attackers can send concurrent requests with identical bootstrap_room values to crash scheduler processes or hang other users' requests until transfer timeout.","status":"published","published":"2026-09-29T17:17:07.147Z","modified":"2026-09-29T18:17:09.033Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-694"],"updated_at":"2026-11-02T14:12:52.413234Z"}],"osv":[{"id":"CVE-2026-102634","title":"SGLang through 0.5.20 Denial of Service via Duplicate bootstrap_room","description":"SGLang through 0.5.20 in prefill/decode disaggregation mode fails to validate duplicate bootstrap_room fields in /generate requests with Mooncake KV transfer backend. Unauthenticated attackers can send concurrent requests with identical bootstrap_room values to crash scheduler processes or hang other users' requests until transfer timeout.","status":"published","published":"2026-09-29T16:04:17.381Z","modified":"2026-10-28T02:30:45.390396798Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-694"],"updated_at":"2026-11-02T15:44:53.83521Z"},{"id":"openSUSE-SU-2026:11947-1","title":"python313-sglang-0.5.20-2.1 on GA media","description":"These are all security issues fixed in the python313-sglang-0.5.20-2.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-10-01T00:00:00Z","modified":"2026-10-02T18:23:13.004553253Z","updated_at":"2026-11-02T16:58:40.245664Z"}]}}