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CVE-2026-95616— Apache WSS4J: Unauthenticated denial of service via integer overflow in DER parsing of X.509 certificate extensions

Quick assessment

Affected
Apache Software Foundation Apache WSS4J
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WSS4J 中 DER 边界检查存在整数溢出漏洞，导致超大内存分配能够通过验证。未经身份验证的攻击者可以发送一个包含 X.509 证书的 SOAP 消息，该证书的 SubjectKeyIdentifier 扩展字段声明的长度为 0x7FFFFFFF。WSS4J 在解析签名密钥引用时会对该字段进行解码，且此过程发生在消息认证之前，因此一个仅 11 字节的扩展字段即可触发约 2 GB 的内存分配。通过重复发送此类请求，攻击者可耗尽服务器内存资源。 建议用户升级至 4.0.2、3.0.6 或 2.4.4 版本，这些版本已

AI Predicted 7.5 Difficulty: Easy

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-95616

Vulnerability Information
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Vulnerability Title
Apache WSS4J: Unauthenticated denial of service via integer overflow in DER parsing of X.509 certificate extensions
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache WSS4J 4.0.0 ~ 4.0.2 -

II. Public POCs for CVE-2026-95616

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III. Intelligence Information for CVE-2026-95616

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Other References for CVE-2026-95616 (1)

Same Patch Batch · Apache Software Foundation · 2026-09-30 · 19 CVEs total

CVE-2026-102508 9.2 CRITICAL Apache PLC4X: OPC UA secure channel: integrity bypass, unverifiable server certificate, an
CVE-2026-94052 9.1 CRITICAL Apache MINA SSHD: LDAP password authentication ineffective
CVE-2026-77185 9.1 CRITICAL Apache MINA SSHD: Asynchronous authentication can bypass signature verification
CVE-2026-94053 9.1 CRITICAL Apache MINA SSHD: LDAP injection in sshd-ldap
CVE-2026-102509 8.7 HIGH Apache PLC4X, Apache PLC4X: Pre-authentication resource exhaustion in the OPC UA driver an
CVE-2026-102510 8.7 HIGH Apache PLC4X: Go binding: unbounded allocation and framing failures on wire-controlled len
CVE-2026-102511 8.5 HIGH Apache PLC4X, Apache PLC4X, Apache PLC4X, Apache PLC4X: ADS discovery accepts spoofed resp
CVE-2026-93994 8.1 HIGH Apache MINA SSHD: Repeated-publickey policy bypass on server
CVE-2026-94002 7.5 HIGH Apache MINA SSHD: Memory exhaustion in SFTP client via unsolicited SFTP replies
CVE-2026-93995 6.5 MEDIUM Apache MINA SSHD: Remote execution of JGit "archive -o=file.zip" can write file on the ser
CVE-2026-94029 6.5 MEDIUM Apache MINA SSHD: Memory exhaustion in SFTP v6 check-file-name/check-file-handle extension
CVE-2026-93996 6.5 MEDIUM Apache MINA SSHD: Memory exhaustion DoS via unbounded SCP command line read
CVE-2026-92899 Apache WSS4J: UsernameToken replay protection bypassed by re-encoding the Nonce
CVE-2026-85532 Apache WSS4J: Insufficient Validation of Derived-Key Parameters
CVE-2026-87830 Apache WSS4J: Streaming WS-SecurityPolicy validation may skip element-protection checks.
CVE-2026-88920 Apache WSS4J: SAML Sender-Vouches Authentication Bypass
CVE-2026-89238 Apache WSS4J: WSS4J EncryptedHeader child confusion causing wrong protected-header selecti
CVE-2026-92121 Apache WSS4J: WS-SecurityPolicy signature checks skipped in the streaming code after an ST

IV. Related Vulnerabilities

Same product: Apache WSS4J
Same vendor: Apache Software Foundation

V. Comments for CVE-2026-95616

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