Apache WSS4J: Unauthenticated denial of service via integer overflow in DER parsing of X.509 certificate extensions (CVE-2026-95616) | HOL Guard CVE

High · CVSS 7.5CVE-2026-95616

Apache WSS4J: Unauthenticated denial of service via integer overflow in DER parsing of X.509 certificate extensions

Answer in brief

CVE-2026-95616 records a High severity (CVSS 7.5) vulnerability in Apache WSS4J: Unauthenticated denial of service via integer overflow in DER parsing of X.509 certificate extensions. The current sources do not mark it as known exploited. The current feed maps Apache Software Foundation/org.apache.wss4j:wss4j-ws-security-common (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 30, 2026Updated Sep 30, 2026Source checked Sep 30, 2026First seen by HOL Sep 30, 2026Material review Sep 30, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.5
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

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 Apache Software Foundation/org.apache.wss4j:wss4j-ws-security-common (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Apache Software Foundation/org.apache.wss4j:wss4j-ws-security-commongeneric	>=4.0.0 <4.0.2 \|\| >=3.0.0 <3.0.6 \|\| >=0 <2.4.4	4.0.2, 3.0.6, 2.4.4

Recommended response

Check inventory. Check lockfiles and deployed manifests for Apache Software Foundation/org.apache.wss4j:wss4j-ws-security-common.
Review the reported fix. Update Apache Software Foundation/org.apache.wss4j:wss4j-ws-security-common to 4.0.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 30, 2026

Sources and claim methodology

Upstream source description

An integer overflow in WSS4J's DER bounds check lets an oversized allocation pass validation. An unauthenticated attacker can send a SOAP message carrying an X.509 certificate whose SubjectKeyIdentifier extension declares a length of 0x7FFFFFFF; WSS4J decodes this while resolving the signature's key reference, before the message is authenticated, so an eleven-byte extension triggers a 2 GB allocation. Repeated requests exhaust server memory. Users are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix this issue.

Quoted source text, attributed separately from HOL analysis.