---
id: CVE-2026-92971
title: >-
  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
summary: >-
  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 a…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-617
vendor: InternLM
product: lmdeploy
affected:
  - lmdeploy <= 0.17.0
published: '2026-09-17'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T20:53:07.383'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92971'
references:
  - url: 'https://github.com/InternLM/lmdeploy'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/InternLM/lmdeploy/blob/v0.17.0/lmdeploy/pytorch/engine/engine_loop.py#L560-L564
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/InternLM/lmdeploy/blob/v0.17.0/lmdeploy/pytorch/utils.py#L187-L214
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/InternLM/lmdeploy/blob/v0.17.0/lmdeploy/serve/openai/endpoints/completions.py#L130-L136
    label: disclosure@vulncheck.com
  - url: 'https://github.com/InternLM/lmdeploy/issues/4965'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/internlm-lmdeploy-through-0.17.0-assertion-denial-of-service
    label: disclosure@vulncheck.com
  - url: 'https://github.com/InternLM/lmdeploy/issues/4965'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00491
epssPercentile: 0.41283
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-17T14:28:49.666490Z'
ingestedAt: '2026-09-17T14:19:30.993Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.