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3.5
CVE-2026-65200: Huawei OpenBMC may read beyond buffer on short responses
CVE-2026-65200 · published 5 days ago
Summary
The OpenBMC device‑management service that handles PLDM and NCSI messages can be tricked by a device that sends an unusually short reply. This causes the software to read far past the intended data area, which could let an attacker cause crashes or gather information. Update the OpenBMC firmware to the latest version that includes the fix, or apply the vendor‑provided patch if one is available.
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| huawei | openbmc | <= 26.06 |
Original advisory text
Huawei malicious on-bus PLDM or NCSI device can drive out-of-bounds-heap reads via short MCTP responses
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.
Internet-facing
60 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit
- Gives an attacker partial control
Type
CWE-191Integer Underflow (Wrap or Wraparound)
Timeline
Published13 Oct 2026
Updated16 Oct 2026
First seen13 Oct 2026
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