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CVE-2026-9071 IBM CVE debrief

CVE-2026-9071 is a denial of service vulnerability in IBM WebSphere Application Server 9.0, 8.5, and Liberty 17.0.0.3 through 26.0.0.6. A remote attacker could exploit this vulnerability by sending a specially-crafted request, causing the server to consume memory resources. This issue has a CVSS score of 7.5 and is considered HIGH severity. IBM has provided a vendor advisory for mitigation. The CVE was published on 2026-06-22T16:16:43.357Z and modified on 2026-06-23T20:46:35.250Z.

Vendor
IBM
Product
WebSphere Application Server
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-22
Original CVE updated
2026-06-23
Advisory published
2026-06-22
Advisory updated
2026-06-23

Who should care

Security teams and administrators responsible for IBM WebSphere Application Server 9.0, 8.5, and Liberty 17.0.0.3 through 26.0.0.6 should be aware of this denial of service vulnerability. This vulnerability could allow a remote attacker to cause the server to consume memory resources, potentially leading to a denial of service. Affected organizations should review and apply the vendor advisory for mitigation.

Technical summary

CVE-2026-9071 is a denial of service vulnerability in IBM WebSphere Application Server 9.0, 8.5, and Liberty 17.0.0.3 through 26.0.0.6. The vulnerability is caused by sending a specially-crafted request, which could allow a remote attacker to cause the server to consume memory resources. The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. The CWE associated with this vulnerability is CWE-400.

Defensive priority

High priority should be given to applying the vendor advisory for mitigation. Security teams should review the affected systems and apply the necessary patches to prevent exploitation.

Recommended defensive actions

  • Review and apply the vendor advisory for mitigation.
  • Check affected systems and apply necessary patches.
  • Monitor server resources for unusual consumption patterns.
  • Implement compensating controls to detect and prevent similar attacks.
  • Update incident response plans to include procedures for responding to denial of service attacks.

Evidence notes

The CVE-2026-9071 record was obtained from the official CVE database and the NVD detail page. The vendor advisory was provided by IBM. The CVSS score and vector were obtained from the NVD detail page. The CWE associated with this vulnerability was obtained from the vendor advisory.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-9071 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-9071

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

  • CVE-2026-9071 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-9071

    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.