Huawei malicious on-bus PLDM or NCSI device can drive out-of-bounds-heap reads via short MCTP responses

Description

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.

Scores

EPSS (exploitation in 30 days)

0.14% · top 96% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Low 3.5.

Weakness

• CWE-191 Integer underflow (wrap or wraparound) (opens in a new tab)All about CWE-191 and its CVEs

Affected products

• Huawei · openBMC

  • affected ≤ 26.06

References (1)

• https://www.runzero.com/advisories/huawei-malicious-device-integer-underflow-cve-2026-65200 (opens in a new tab)third-party-advisory

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-65200](https://trackcve.app/badge/CVE-2026-65200.svg)](https://trackcve.app/cve/CVE-2026-65200)

Record last updated 14 Oct 2026, 18:58 UTC.