CVE-2026-15064: IBM WebSphere Application Server 9.0, and 8.5 and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.7 is vulnerable to HTTP Response Smuggling due to improper hand

highCVSS 8.7CVE-2026-15064

IBM WebSphere Application Server 9.0, and 8.5 and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.7 is vulnerable to HTTP Response Smuggling due to improper handling of non-standard HTTP version tokens.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: high — CVSS 8.7
Published: 2026-07-28
Last updated: 2026-07-30
Exploitation: Not in CISA KEV at last sync

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

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-150640.22% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 13% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-15064	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[NEW] [high] IBM WebSphere Application Server and Application Server Liberty: Multiple vulnerabilitiescert-bund
unknownIBM WebSphere Products Multiple Vulnerabilitieshkcert

Recent advisories for IBM WebSphere Application

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

medium[NEU] [mittel] IBM WebSphere Application Server: Mehrere Schwachstellen ermöglichen Denial of Servicecert-bund · 2026-07-31
high[NEW] [high] IBM WebSphere Application Server and Application Server Liberty: Multiple vulnerabilitiescert-bund · 2026-07-31
medium[NEW] [medium] IBM WebSphere Application Server Liberty: Multiple vulnerabilities allow denial of servicecert-bund · 2026-07-31
medium[NEW] [medium] IBM WebSphere Application Server: Vulnerability allows bypassing security measurescert-bund · 2026-07-31
high[UPDATE] [high] IBM WebSphere Application Server and Application Server Liberty: Multiple vulnerabilitiescert-bund · 2026-07-31
highCVE-2026-11536: IBM WebSphere Application Server 9.0, and 8.5 is affected by a remote code execution vulnerabi…nvd · 2026-07-30