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AMI MegaRAC SP-X and OpenBMC

CVE-2026-16141

high 8.1CVSS 3.1 · published 2026-09-15 · modified 2026-09-18

OpenBMC's IPMI implementation, phosphor-net-ipmid, contains a logic flaw in which an unauthenticated client can force the RAKP Message 1 handler to return before it overwrites the authentication object's constructor defaults. The IPMI service then accepts a RAKP Message 3 whose HMAC is computed with the constant 20-byte 'userKey' initialized from the string '0penBmc' and an often-predictable 'bmcRandomNum'. Several downstream vendors implement phosphor-net-ipmid as their IPMI stack, such as NVIDIA and H3C.

What to do

NVD gives no version range for this CVE yet, so this page cannot name an update version. Read the vendor advisory for the fixed firmware.

NVD names no vendor advisory for it. Look it up at AMI and OpenBMC security advisories (search for CVE-2026-16141).

How this page decided
Severity and CVSS: the primary NVD score (version 3.1). Affected versions: the CPE ranges in the NVD record, modified 2026-09-18. Exploited: the CISA KEV field of the NVD record. Whether you are affected needs your firmware version; this page does not know it. It is not tested against a device.

Do you run it?

Paste your BMC's Redfish answers into the Redfish Inspector: it compares the firmware version with the NVD ranges, in your browser. Or scan every BMC with the free scan.

Source: NVD CVE-2026-16141. PWX for MegaRAC and OpenBMC

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