CVE-2026-21427

Code execution via uncontrolled DLL search path

Published Jan 8, 2026 · Updated Jan 8, 2026

Uncontrolled DLL loading in all versions of Pioneer Stellanova and USB DAC Amplifier installers allows local users to execute code. The Windows driver installers resolve and load Dynamic Link Libraries through an uncontrolled search path, allowing a planted library to be selected. Exploitation requires a local user to place a crafted DLL where an affected installer searches and another user to run it; code receives the installer's privileges.

CVSS severity8.5
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled DLL loading in all versions of Pioneer Stellanova and USB DAC Amplifier installers allows local users to execute code. The Windows driver installers resolve and load Dynamic Link Libraries through an uncontrolled search path, allowing a planted library to be selected. Exploitation requires a local user to place a crafted DLL where an affected installer searches and another user to run it; code receives the installer's privileges.

The record

CVE
CVE-2026-21427
Published
Jan 8, 2026
Updated
Jan 8, 2026
Vendor
Pioneer Corporation
Product
Stellanova Limited
Classifications
CWE-427, T1574.001
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=all versions

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Pioneer Corporation · Stellanova Limitedversion=all versions
Pioneer Corporation · Stellanova Liteversion=all versions
Pioneer Corporation · USB DAC Amplifierversion=all versions
Pioneer Corporation · Stellanovaversion=all versions

Published CVSS scores

7.8JPCERT/CCCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.5JPCERT/CCCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-427Uncontrolled Search Path Element
T1574.001DLL Search Order Hijacking

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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