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CVE-2026-15064 IBM CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-28T21:17:27.493Z and has not been modified since then. IBM WebSphere Application Server 9.0, 8.5, and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.7 are vulnerable to HTTP Response Smuggling due to improper handling of non-standard HTTP version tokens. This vulnerability has a high CVSS score of 8.7 and could allow attackers to smuggle HTTP responses, potentially leading to security issues. Organizations should review and update server configurations to ensure proper handling of HTTP version tokens and monitor server logs for potential HTTP Response Smuggling attacks. The CVSS vector is CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N.

Vendor
IBM
Product
WebSphere Application Server
CVSS
HIGH 8.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-28
Original CVE updated
2026-08-05
Advisory published
2026-07-28
Advisory updated
2026-08-05

Who should care

Organizations using IBM WebSphere Application Server 9.0, 8.5, and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.7 should be aware of this vulnerability and take steps to patch or mitigate it.

Technical summary

IBM WebSphere Application Server 9.0, 8.5, and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.7 are vulnerable to HTTP Response Smuggling due to improper handling of non-standard HTTP version tokens. This vulnerability has a high CVSS score of 8.7 and could allow attackers to smuggle HTTP responses, potentially leading to security issues.

Defensive priority

Organizations using IBM WebSphere Application Server 9.0, 8.5, and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.7 should prioritize patching due to the high CVSS score of 8.7 and the potential for HTTP Response Smuggling attacks.

Recommended defensive actions

  • Apply patches or updates to IBM WebSphere Application Server 9.0, 8.5, and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.7
  • Review and update server configurations to ensure proper handling of HTTP version tokens
  • Monitor server logs for potential HTTP Response Smuggling attacks

Evidence notes

The CVE record indicates that IBM WebSphere Application Server 9.0, 8.5, and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.7 are vulnerable to HTTP Response Smuggling due to improper handling of non-standard HTTP version tokens. The CVSS vector is CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-15064 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-15064

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

  • CVE-2026-15064 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-15064

    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.