CVE-2026-16141
OpenBMC IPMI Authentication Bypass via Default userKey and Stale Challenge Value
Description
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.
INFO
Published Date :
Sept. 15, 2026, 2:16 p.m.
Last Modified :
Sept. 15, 2026, 2:16 p.m.
Remotely Exploit :
Yes !
Source :
44488dab-36db-4358-99f9-bc116477f914
Affected Products
The following products are affected by CVE-2026-16141
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 44488dab-36db-4358-99f9-bc116477f914 |
Solution
- Update phosphor-net-ipmid to the latest version.
- Ensure proper RAKP message handling.
- Validate HMAC computation with dynamic keys.
- Deploy patches to affected downstream vendors.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-16141.
| URL | Resource |
|---|---|
| https://www.runzero.com/advisories/openbmc-ipmi-auth-bypass-rakp-cve-2026-16141/ |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-16141 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-16141
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-16141 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-16141 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 44488dab-36db-4358-99f9-bc116477f914
Sep. 15, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-798 Added CWE CWE-457 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/16xxx/CVE-2026-16141.json">CVE-2026-16141</a> Added Reference https://www.runzero.com/advisories/openbmc-ipmi-auth-bypass-rakp-cve-2026-16141/