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CVE-2026-71374 – Remote Code Execution via Insecure Deserialization – Hitachi Cosminexus Component C

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Summary

CVE-2026-71374 is a critical insecure deserialization vulnerability (CWE-502) affecting Hitachi Cosminexus Component Container, a Java application server middleware component used across the Cosminexus V9 and V11 product lines. The flaw allows an unauthenticated, remote attacker to submit crafted serialized data that the container processes without adequate validation, potentially resulting in arbitrary object injection and full compromise of confidentiality, integrity, and availability. Hitachi rates this issue Critical with a CVSS v3.1 base score of 9.8.

Technical details

  • Root cause: Cosminexus Component Container deserializes untrusted input without proper type/origin validation, enabling object injection (CAPEC-586) when a malicious serialized payload is processed.
  • Trigger conditions: An attacker sends a specially crafted serialized data stream to a network-exposed service endpoint handled by the affected container component; no authentication or user interaction is required.
  • Attack vector: Network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N).
  • Impact: Successful exploitation can lead to arbitrary code execution in the context of the application server process, with high impact to confidentiality, integrity, and availability of the affected system.

Affected software

Hitachi Cosminexus Component Container, all supported platforms (Windows, Linux, AIX, and HP-UX where applicable):

  • V11 line: 11-00 through 11-00-12, 11-10 through 11-10-11, 11-20 through 11-20-09, 11-30 through 11-30-08, 11-40 through 11-40-03, 11-50 through 11-50-03, 11-60 through 11-60-02, 11-70-01 through 11-70-02
  • V9 line: 09-00 through 09-00-18, 09-50 through 09-50-22, 09-70 through 09-70-27, 09-80 through 09-80-04, 09-87 through 09-87-09

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade to the fixed versions published by Hitachi:
    • Windows/Linux: 09-70-28, 09-87-10, 11-20-10, 11-60-03, 11-70-03
    • AIX: 09-80-05, 11-00-13
  • If immediate patching is not possible: Hitachi’s advisory does not describe a workaround; restrict network exposure of affected Cosminexus Component Container services (e.g., place behind a firewall/VPN, limit access to trusted internal networks only) and monitor for anomalous serialized-object traffic until the patch can be applied. Organizations should treat this as an urgent patching priority given the unauthenticated, network-exploitable nature of the flaw.

References

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