EUVD-2026-82984
GHSA-hpqj-j2xw-q3cx
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 attacker trivially exhausts memory (AV:N/AC:L/PR:N); pure availability loss (A:H, C:N/I:N); the disaggregation/Mooncake requirement is a deployment precondition, not per-attack complexity, so AC:L retained.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
SGLang through 0.5.19 in prefill/decode disaggregation mode with Mooncake KV transfer backend fails to validate bootstrap_room values, allowing unbounded transfer state allocation. Unauthenticated attackers can reach the decode engine's POST /generate endpoint and submit arbitrary bootstrap_room values to exhaust prefill process memory until out-of-memory termination.
AnalysisAI
Unauthenticated memory exhaustion in SGLang through 0.5.19 lets remote attackers force out-of-memory termination of the prefill process by submitting arbitrary bootstrap_room values to the decode engine's POST /generate endpoint. The flaw only manifests in a non-default deployment: prefill/decode disaggregation mode with the Mooncake KV transfer backend enabled, which is not the standard monolithic serving configuration, and the endpoint must be network-reachable. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires SGLang (through 0.5.19) deployed in prefill/decode disaggregation mode with the Mooncake KV transfer backend enabled - this is NOT the default single-process serving configuration. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but scope-limited availability risk. … 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 vendor-released patch was identified at time of analysis; the only upstream artefact in the input data is the tracking issue at https://github.com/sgl-project/sglang/issues/39428, so operators should monitor that issue and the repository at https://github.com/sgl-project/sglang for a fixed release and upgrade as soon as one is tagged (do not assume any specific version number beyond 0.5.19 is fixed). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all SGLang deployments (version 0.5.19 and earlier) to determine if prefill/decode disaggregation mode with Mooncake KV transfer is enabled; if so, immediately restrict network access to the decode engine's POST /generate endpoint or disable the vulnerable configuration. …
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View allVendor StatusVendor
SUSE
Severity: Important| Product | Status |
|---|---|
| openSUSE Tumbleweed | Fixed |
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