CVE-2026-65200
CVE-2026-65200
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.
Published .
CVSS v3 metric
CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Weakness classification (CWE)
References
- 44488dab-36db-4358-99f9-bc116477f914 (third-party-advisory)
Frequently asked questions
- What is CVE-2026-65200?
- CVE-2026-65200 is a low-severity vulnerability, classified under Integer Underflow. CVSS score: 3.5/10. Published 2026-10-13.
- How severe is CVE-2026-65200?
- Low severity. CVSS v3 base score is 3.5 out of 10.