EUVD-2026-81580
GHSA-3j7h-8qqw-4p7v
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 request with a trivial empty-list payload (AC:L/PR:N) crashes the engine for an availability-only impact (A:H; C:N/I:N); DistServe-mode dependency is a deployment gate rather than per-attack complexity.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
InternLM LMDeploy through 0.17.0 contains a reachable assertion vulnerability in the DistServe decode migration loop that allows unauthenticated attackers to terminate the inference engine. Attackers can submit a migration_request with an empty remote_block_ids list to trigger an AssertionError that crashes the engine loop and causes subsequent inference requests to fail.
AnalysisAI
Denial of service in InternLM LMDeploy through 0.17.0 lets unauthenticated remote attackers crash the distributed inference engine by sending a migration_request whose remote_block_ids list is empty, which trips a reachable assertion in the DistServe decode migration loop and terminates the engine so that all subsequent inference requests fail (CWE-617, CVSS 4.0 8.7; availability-only, VC:N/VI:N/VA:H). Exploitation requires the target to be running in DistServe disaggregated prefill-decode serving mode with the migration path reachable - a non-default, multi-node topology that is the primary limiting factor, since standard single-node deployments are not exposed through this path. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the target LMDeploy instance (≤0.17.0) to be running in DistServe disaggregated prefill-decode serving mode with the migration path reachable - this is a non-default, multi-node serving topology, which is the primary limiting factor. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is an availability-only denial-of-service issue (CVSS 4.0 8.7, vector VC:N/VI:N/VA:H) - no confidentiality or integrity impact, so the 'HIGH' score is driven entirely by the crash of a critical service. … 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 identified at time of analysis; there is no fixed version to upgrade to in the available data, so the primary action is to track https://github.com/InternLM/lmdeploy/issues/4965 and the VulnCheck advisory (https://www.vulncheck.com/advisories/internlm-lmdeploy-through-0.17.0-assertion-denial-of-service) for an upstream fix and upgrade as soon as a release pins the assertion to an explicit input-validation check. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all deployments of InternLM LMDeploy version 0.17.0 or earlier that are running in DistServe disaggregated prefill-decode serving mode with the migration path reachable, and if such deployments exist, immediately block external access to the migration port via firewall rules or network segmentation. …
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Same weakness CWE-617 – Reachable Assertion
View allSame technique Denial Of Service
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External POC / Exploit Code
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