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Back to active CVEs
High · CVSS 7.5CVE-2026-13759

IBM WebSphere eXtreme Scale is affected by Insecure DeserilizationCVE-2026-13759

Answer in brief

CVE-2026-13759 records a High severity (CVSS 7.5) vulnerability in IBM WebSphere eXtreme Scale is affected by Insecure Deserilization. The current sources do not mark it as known exploited. The current feed maps IBM/WebSphere Extreme Scale (generic), IBM/WebSphere Extreme Scale (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 Jun 30, 2026Updated Oct 25, 2026Source checked Nov 3, 2026First seen by HOL Jun 30, 2026Material review Oct 25, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
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 7.5. 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 Extreme Scale (generic), IBM/WebSphere Extreme Scale (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:ibm:websphere_extreme_scale:*:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
IBM/WebSphere Extreme Scalegeneric8.6.1.0Not reported
IBM/WebSphere Extreme Scalegeneric>=8.6.1.0 <=8.6.1.6Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for IBM/WebSphere Extreme Scale, IBM/WebSphere Extreme Scale.
  2. 2Review the reported fix. Source-reported solution: We recommend customer to enable encryption. Please follow the link to enable encryption. https://www.ibm.com/docs/en/wxs/latest?topic=sydgies-securing-data-that-flows-between-extreme-scale-clients-servers-ssl-encryption. For extra security customer can enable JEP 290 global JVM deserialization filter (-Djdk.serialFilter) while starting catalog and container servers.JEP 290 is available from 8.0.8.5 onwards.

Evidence timeline and material changes

  1. Published upstream

    Jun 30, 2026

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

  2. Source modified

    Oct 25, 2026

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

  3. First seen by HOL

    Jun 30, 2026

Sources and claim methodology

  • Source referenceibm.com
Upstream source description

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 ships three ObjectInputStream subclasses (WsObjectInputStream, ObjectStreamPool$ReusableInputStream, ObjectInputStreamResolver) that install no JEP-290 class filter; when Coherence is on the classpath, multiple RCE gadget chains including RemoteConstructor.readResolve and PriorityQueue/ExtractorComparator are confirmed working, allowing a post-login attacker who can write a session attribute or a LAN-adjacent attacker on the grid replication wire to execute arbitrary code on peer WAS JVMs

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Ultra Addons for Contact Form 7 <= 3.5.54 - Unauthenticated PHP Object Injection to Arbitrary File Deletion via CF7 Form FieldAlso CWE-502
  • labbench before 0.46.1 Deserialization of Untrusted Data via read() Pickle Auto-DispatchAlso CWE-502

Record context

Vulnerability class
Deserialization
EPSS
Not reported
CWE IDs
CWE-502
Source
CVE List V5
Source checked
Nov 3, 2026
References
1 linked source
Open source record