---
id: CVE-2026-65200
title: >-
  The openUBMC device-management process parses PLDM-over-MCTP and
  NCSI-over-MCTP responses from on-bus devices, and three response parsers in
  the shared transport libraries subtract a fixed header or reserved-field size
  from a device-supp…
summary: >-
  The openUBMC device-management process parses PLDM-over-MCTP and
  NCSI-over-MCTP responses from on-bus devices, and three response parsers in
  the shared transport libraries subtract a fixed header or reserved-field size
  from a device-supp…
severity: low
cvss: 3.5
cvssVector: 'CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L'
cwe:
  - CWE-191
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T15:17:47.077'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-65200'
references:
  - url: >-
      https://www.runzero.com/advisories/huawei-malicious-device-integer-underflow-cve-2026-65200
    label: 44488dab-36db-4358-99f9-bc116477f914
tags:
  - nvd
ingestedAt: '2026-10-13T15:33:40.080Z'
---

## Overview

The openUBMC device-management process parses PLDM-over-MCTP and NCSI-over-MCTP responses from on-bus devices, and three response parsers in the shared transport libraries subtract a fixed header or reserved-field size from a device-supplied response length without a lower-bound check. An undersized response wraps the unsigned length difference to a very large value, and the parser then reads far past the response buffer. The affected code sits in the base (non-vendor) PLDM control class and the Huawei NCSI driver, so it is reachable for any PLDM endpoint or Huawei NIC on the internal management bus, unlike the vendor-specific wangxun parser tracked separately.

## Remediation

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