---
id: CVE-2026-95616
title: >-
  An integer overflow in WSS4J's DER bounds check lets an oversized allocation
  pass validation
summary: >-
  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
  0x7…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-190
vendor: apache
product: wss4j
affected:
  - wss4j < 2.4.4
  - 'wss4j >= 3.0.0, < 3.0.6'
  - 'wss4j >= 4.0.0, < 4.0.2'
patched:
  - wss4j 4.0.2
published: '2026-09-30'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T17:21:33.233'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-95616'
references:
  - url: 'https://lists.apache.org/thread.html/sdf0fsphkg4qbj7nh2brjgwvcmd67hct'
    label: security@apache.org
  - url: 'http://www.openwall.com/lists/oss-security/2026/09/30/14'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - cve.org
epss: 0.00409
epssPercentile: 0.34963
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-30T12:43:35.342143Z'
ingestedAt: '2026-09-30T13:03:51.968Z'
---

## Overview

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.

## Affected

- `wss4j < 2.4.4`
- `wss4j >= 3.0.0, < 3.0.6`
- `wss4j >= 4.0.0, < 4.0.2`

## Remediation

Upgrade past the affected range:

- `wss4j 4.0.2`