High · published September 30, 2026
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.
| Product | Versions | Fixed in |
|---|---|---|
| apache/wss4j | < 2.4.4 | 2.4.4 |
| apache/wss4j | ≥ 3.0.0, < 3.0.6 | 3.0.6 |
| apache/wss4j | ≥ 4.0.0, < 4.0.2 | 4.0.2 |