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PatchSiren cyber security CVE debrief

CVE-2026-28704 Japan Computer Emergency Response Team Coordination Center (JPCERT/CC) CVE debrief

CVE-2026-28704 is a high-severity vulnerability in JPCERT's EmoCheck, a tool designed to detect and analyze malware. The vulnerability exists due to insecure loading of Dynamic Link Libraries (DLLs). An attacker can exploit this vulnerability by placing a crafted DLL file in the same directory as EmoCheck, allowing arbitrary code execution with the privileges of the user invoking EmoCheck. The vulnerability has a CVSS score of 8.4 and is classified as HIGH severity.

Vendor
Japan Computer Emergency Response Team Coordination Center (JPCERT/CC)
Product
Emocheck
CVSS
HIGH 8.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-10
Original CVE updated
2026-06-08
Advisory published
2026-04-10
Advisory updated
2026-06-08

Who should care

Users of EmoCheck, particularly those in environments where the tool is used to detect and analyze malware, should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The vulnerability is caused by EmoCheck's insecure DLL loading mechanism. When EmoCheck is executed, it loads DLLs from the same directory. An attacker can exploit this by creating a crafted DLL with the same name as a legitimate DLL required by EmoCheck, allowing arbitrary code execution when EmoCheck is run.

Defensive priority

High

Recommended defensive actions

  • Update EmoCheck to the latest version, if available.
  • Ensure that the directory containing EmoCheck is restricted to authorized users only.
  • Use secure coding practices when developing and loading DLLs.
  • Monitor the directory containing EmoCheck for suspicious activity.

Evidence notes

The vulnerability was reported by JPCERT and is tracked as CVE-2026-28704. The CVSS score is 8.4, indicating high severity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-28704 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-28704

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-28704 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-28704

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.