CVE-2026-93994— Apache MINA SSHD: Repeated-publickey policy bypass on server
Quick assessment
Affected
Apache Software Foundation Apache MINA SSHD
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.
Apache MINA SSHD 是一个用于客户端和服务器端 SSH 的 Java 库。SSH 服务器可以配置为要求使用多种身份验证方案，例如要求提供两个不同的公钥，而不仅仅是一个。在 OpenSSH 中，这可以通过在 文件中设置 来实现。Apache MINA SSHD 提供了等效的配置机制。 在 Apache MINA SSHD 2.19.0 及更早版本，以及 3.0.0-M1 至 3.0.0-M5 版本中， 组件中的服务器端代码并未强制要求所提交的两个公钥必须不同。因此，用户只需将同一个密钥对中的单个公钥提交
Possible ATT&CK Techniques 1 AI
T1078 · Valid Accounts
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I. Basic Information for CVE-2026-93994
Vulnerability Information
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Vulnerability Title
Apache MINA SSHD: Repeated-publickey policy bypass on server
Source: CVE Program / CVE List V5
Vulnerability Description
Apache MINA SSHD is a Java library for client-side and server-side SSH. SSH servers can be configured to require multi-authentication schemes, for instance two different public keys, not just one. In OpenSSH, this would be done by setting in sshd_config AuthenticationMethods "publickey,publickey". Apache MINA SSHD provides an equivalent configuration mechanism.
In Apache MINA SSHD versions up to 2.19.0 and 3.0.0-M1 to 3.0.0-M5 the server code in component sshd-core does not enforce that the two public keys presented are different. A user can thus successfully authenticate with only one of the two key pairs required by presenting this single key twice. This is a partial authentication bypass.
Users are recommended to upgrade to version 2.20.0 or 3.0.0-M6, which fix this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证中关键步骤缺失
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Apache Software Foundation | Apache MINA SSHD | 0 ~ 2.20.0 | - |
|
II. Public POCs for CVE-2026-93994
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-93994 (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-2026-94002 | 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-2026-95616 | Apache WSS4J: Unauthenticated denial of service via integer overflow in DER parsing of X.5 | |
| 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 | |
| CVE-2026-92899 | Apache WSS4J: UsernameToken replay protection bypassed by re-encoding the Nonce |
IV. Related Vulnerabilities
Same product: Apache MINA SSHD
-
CVE-2026-77185
Apache MINA SSHD: Asynchronous authentication can bypass sig -
CVE-2026-94053
Apache MINA SSHD: LDAP injection in sshd-ldap -
CVE-2026-93995
Apache MINA SSHD: Remote execution of JGit "archive -o=file. -
CVE-2026-93996
Apache MINA SSHD: Memory exhaustion DoS via unbounded SCP co -
CVE-2026-94002
Apache MINA SSHD: Memory exhaustion in SFTP client via unsol
Same vendor: Apache Software Foundation
-
CVE-2026-95616
Apache WSS4J: Unauthenticated denial of service via integer -
CVE-2026-92899
Apache WSS4J: UsernameToken replay protection bypassed by re -
CVE-2026-92121
Apache WSS4J: WS-SecurityPolicy signature checks skipped in -
CVE-2026-89238
Apache WSS4J: WSS4J EncryptedHeader child confusion causing -
CVE-2026-88920
Apache WSS4J: SAML Sender-Vouches Authentication Bypass
Same weakness: CWE-304
-
CVE-2026-94052
Apache MINA SSHD: LDAP password authentication ineffective -
CVE-2026-100667
grav-plugin-login 3.8.7 through 3.9.6 Two-Factor Authenticat -
CVE-2026-54723
devpi: Database contents leak -
CVE-2023-54391
Proxmox VE 7.0-8.0 Authentication Bypass via tfa-challenge P -
CVE-2026-59564
Authentication bypass between ZCC and client connector porta
V. Comments for CVE-2026-93994
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