EUVD-2026-89029
GHSA-mjgp-hgfr-77jq
Severity by source
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
Unauthenticated network requests (PR:N/AV:N) trivially trigger the crash/hang with no user interaction; impact is availability-only (A:H), no confidentiality or integrity effect.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Denial of service in SGLang 0.5.20 and earlier: the /generate HTTP endpoint in prefill/decode (PD) disaggregation deployments using the Mooncake KV transfer backend does not validate duplicate bootstrap_room identifiers, so remote unauthenticated attackers who fire concurrent requests carrying the same bootstrap_room value can crash scheduler processes or stall other users' requests until the transfer times out. The attack is trivial and requires no authentication or user interaction (CVSS 4.0 AV:N/AC:L/PR:N/UI:N, availability-only VA:H), but it only affects the non-default multi-node PD disaggregation configuration with the Mooncake backend; single-node and default deployments are unaffected. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the SGLang server to be deployed in prefill/decode (PD) disaggregation mode using the Mooncake KV transfer backend - a specialized, non-default multi-node serving configuration; single-node/default deployments are not affected. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H) is internally consistent with the description: a network-reachable, low-complexity, unauthenticated attack producing availability-only impact (VA:H, with VC/VI/VA confidentiality and integrity at N - this is a pure denial-of-service, not RCE or data exposure). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No exact fixed version is stated in the available data, so first track upstream issue https://github.com/sgl-project/sglang/issues/40125 and the VulnCheck advisory (https://www.vulncheck.com/advisories/sglang-through-0.5.20-denial-of-service-via-duplicate-bootstrap-room) for the patched release, then upgrade SGLang beyond 0.5.20 to a release that validates bootstrap_room uniqueness. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all SGLang 0.5.20 and earlier installations and confirm whether they use the Mooncake KV transfer backend in multi-node prefill/decode (PD) disaggregation; restrict access to the /generate HTTP endpoint to trusted networks or clients using firewall rules, API gateways, or ingress controls, and enable logging and alerting for duplicate bootstrap_room values and scheduler crashes. …
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External POC / Exploit Code
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