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Back to active CVEs
Medium · CVSS 6.5CVE-2026-15396

IBM WebSphere Application Server IBM WebSphere Application Server - Liberty HTTP Request SmugglingCVE-2026-15396

Answer in brief

CVE-2026-15396 records a Medium severity (CVSS 6.5) vulnerability in IBM WebSphere Application Server IBM WebSphere Application Server - Liberty HTTP Request Smuggling. The current sources do not mark it as known exploited. The current feed maps IBM/WebSphere Application Server (generic), IBM/WebSphere Application Server - Liberty (generic), IBM/WebSphere Application Server - Liberty (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 14, 2026Updated Oct 22, 2026Source checked Oct 22, 2026First seen by HOL Sep 14, 2026Material review Oct 22, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.5
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 6.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps IBM/WebSphere Application Server (generic), IBM/WebSphere Application Server - Liberty (generic), IBM/WebSphere Application Server - Liberty (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
IBM/WebSphere Application Servergeneric9.0 || 8.5Not reported
IBM/WebSphere Application Server - Libertygeneric>=19.0.0.7 <=26.0.0.5Not reported
IBM/WebSphere Application Server - Libertygeneric>=17.0.0.3 <=26.0.0.5Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for IBM/WebSphere Application Server, IBM/WebSphere Application Server - Liberty, IBM/WebSphere Application Server - Liberty.
  2. 2Review the reported fix. Source-reported solution: IBM strongly recommends addressing the vulnerabilities now by applying the fix pack(s) listed below. For IBM WebSphere Application Server traditional: For V9.0.0.0 through 9.0.5.28: · Apply Fix Pack 9.0.5.29 SB0030823 (availability September 2026) or later fix pack.  For V8.5.0.0 through 8.5.5.30: · Apply Fix Pack 8.5.5.31 https://www.ibm.com/support/pages/node/7285869 (availability September 2026) or later fix pack.  For IBM WebSphere Application Server Liberty 17.0.0.3 - 26.0.0.8: · Apply Liberty Fix Pack 26.0.0.9 https://www.ibm.com/support/pages/node/7285875 (availability September 2026) or later fix pack.

Evidence timeline and material changes

  1. Published upstream

    Sep 14, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 22, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 14, 2026

Sources and claim methodology

  • Source referenceibm.com
  • Source referenceibm.com
Upstream source description

IBM WebSphere Application Server 8.5 and 9.0, and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.8 are vulnerable to HTTP request smuggling, caused by improper parsing of the HTTP transfer-encoding request header. By sending a specially crafted HTTP transfer-encoding request header, an attacker could exploit this vulnerability to poison the web cache, bypass web application firewall protection, and conduct XSS attacks.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-444
Source
CVE List V5
Source checked
Oct 22, 2026
References
2 linked sources
Open source record