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CVE-2026-16141

OpenBMC IPMI Authentication Bypass via Default userKey and Stale Challenge Value

CVSS 3.1 8.1 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-16141

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-16141

Published

phosphor-net-ipmid

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "OpenBMC",
                    "product": "phosphor-net-ipmid",
                    "repo": "https://github.com/openbmc/phosphor-net-ipmid",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0",
                            "lessThanOrEqual": "ba6efc502e6b1fabb8ed1ca677ae5eedd64b6361",
                            "versionType": "git"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON