CVE-2026-95616

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.

Score

CVSS 3.1 7.5 High

Status

Analyzed - security@apache.org

Published

2026-09-30

Last modified

2026-10-06

Weaknesses

CWE-190

Affected products

• Wss4j (Apache)
• Apache Wss4j (Apache Software Foundation)

References

• https://lists.apache.org/thread.html/sdf0fsphkg4qbj7nh2brjgwvcmd67hct
• http://www.openwall.com/lists/oss-security/2026/09/30/14