Answer in brief
CVE-2026-16141 records a High severity (CVSS 8.1) vulnerability in OpenBMC IPMI Authentication Bypass via Default userKey and Stale Challenge Value. The current sources do not mark it as known exploited. The current feed maps OpenBMC/phosphor-net-ipmid (generic), OpenBMC/phosphor-net-ipmid (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps OpenBMC/phosphor-net-ipmid (generic), OpenBMC/phosphor-net-ipmid (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| OpenBMC/phosphor-net-ipmidgeneric | >=0 <=ba6efc502e6b1fabb8ed1ca677ae5eedd64b6361 | Not reported |
| OpenBMC/phosphor-net-ipmidgeneric | 0 | Not reported |
Published upstream
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.