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Uncontrolled Search Path (DLL Hijack)Weakness · CWE-427

CVE-2026-21427

HIGH · 7.8 CVSS v3.0 Published 2026-01-08
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
81/100
Remediation priority · High
No privileges

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
The installers for multiple products provided by PIONEER CORPORATION contain an issue with the DLL search path, which may lead to insecurely loading Dynamic Link Libraries. As a result, arbitrary code may be executed with the privileges of the running installer.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

PIONEER CORPORATION installers contain a DLL search path vulnerability (CWE-427) where the installer insecurely loads Dynamic Link Libraries without using fully qualified paths. An attacker can place a malicious DLL in a directory that gets searched before the legitimate DLL location (such as the installer directory or current working directory), causing arbitrary code execution with the elevated privileges of the running installer.

MitigationReplace and rebuild affected product installers to use secure DLL loading practices: specify full absolute paths for all DLL dependencies, use Windows manifest binding, or embed required DLLs within the installer package. Until fixed, avoid running PIONEER installers from untrusted or shared directories.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify the PIONEER installer file
    Locate the installer executable (.exe) for any PIONEER software product and right-click to view Properties, then check the Details tab for Product Name and Version information
    Affected if The installer is published by PIONEER CORPORATION and the version cannot be confirmed as patched for DLL search path vulnerabilities
  2. Analyze DLL dependencies for insecure loading
    Use a tool like dumpbin /dependents or Dependencies Walker (depends.exe) to open the PIONEER installer executable and examine the imported DLLs; check if any DLLs are listed without full absolute paths (e.g., shown as user32.dll rather than C:\Windows\System32\user32.dll)
    Affected if The installer imports DLLs using relative or unqualified names, indicating it relies on the Windows DLL search order
  3. Check for DLL hijacking opportunities in installer directory
    Examine the directory where the PIONEER installer is located and list all DLL files present in that folder using 'dir /b' in Command Prompt
    Affected if Any DLL files exist in the same folder as the installer that are not part of the Windows system DLLs (e.g., custom named DLLs that could be replaced)
  4. Verify installer execution context
    Open Command Prompt, navigate to a test directory (not the installer directory), and run the installer from there using the full path to the installer executable; observe if the installer still functions or fails due to missing DLLs
    Affected if The installer fails or behaves differently when run from a different directory, indicating it relies on DLLs being found in the current working directory or installer folder
  5. Inspect installer for embedded DLLs or manifest
    Use 7-Zip or another archive tool to open the installer executable as an archive and examine its contents for any embedded DLL files or application manifest configuration
    Affected if The installer package does not contain or embed required DLLs and instead searches for them on the file system at runtime

A user is affected if they are running any PIONEER CORPORATION installer that loads DLLs without fully qualified paths, allowing a malicious DLL placed in the installer directory, current working directory, or a directory earlier in the search order to be loaded with elevated privileges.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Replace and rebuild affected product installers to use secure DLL loading practices: specify full absolute paths for all DLL dependencies, use Windows manifest binding, or embed required DLLs within the installer package. Until fixed, avoid running PIONEER installers from untrusted or shared directories.

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation16.0 h
  • Testing8.0 h
  • Review / QA4.0 h
32.0 hours of engineering $5,600
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-21427 in production — separate from our analysis above.

No notes yet

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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