CVE-2026-11897 IBM CVE debrief

Who should care

Defenders responsible for systems using IBM WebSphere Application Server - Liberty should assess exposure and potential impact due to a denial of service vulnerability. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify systems using IBM WebSphere Application Server - Liberty versions 17.0.0.3 through 26.0.0.7 and apply necessary patches or mitigations.

Why it matters

Defenders should prioritize verifying exposure and assessing potential impact on systems using IBM WebSphere Application Server - Liberty versions 17.0.0.3 through 26.0.0.7 due to a denial of service vulnerability.

• Denial of service due to memory resource consumption
• Potential system downtime or performance degradation

Technical summary

IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.7 is vulnerable to a denial of service, caused by sending a specially crafted request. This vulnerability could lead to memory resource consumption, potentially causing system downtime or performance degradation. Defenders should prioritize verifying exposure and assessing potential impact on systems using these versions of IBM WebSphere Application Server - Liberty. The vulnerability has a CVSS score of 7.5 and is classified as HIGH severity. There are no known exploits or additional details beyond the vendor advisory and CVE record.

Defensive priority

Defenders should prioritize verifying exposure and assessing potential impact on systems using IBM WebSphere Application Server - Liberty versions 17.0.0.3 through 26.0.0.7.

Recommended defensive actions

• Verify inventory of systems using IBM WebSphere Application Server - Liberty
• Assess potential exposure and impact on affected systems
• Review and apply vendor-provided patches or updates
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its CVSS score of 7.5 and HIGH severity. The vulnerability affects IBM WebSphere Application Server - Liberty versions 17.0.0.3 through 26.0.0.7. Defenders should verify exposure and assess potential impact on systems using these versions. The CVE record was published on 2026-07-30T15:16:24.143Z and has not been modified since then.

Sources and 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.