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CVE-2026-94029— Apache MINA SSHD: Memory exhaustion in SFTP v6 check-file-name/check-file-handle extension

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 1.0.0 至 2.19.0 以及 3.0.0-M1 至 3.0.0-M5 版本中，sshd-sftp 组件的 SFTP v6 check-file-name/check-file-handle 扩展存在服务端内存耗尽漏洞。Apache MINA SSHD 是一个用于客户端和服务端 SSH 的 Java 库。 当对一个大文件使用极小的“块大小”（例如最小值 256）时，会生成大量哈希值（数量为文件大小除以块大小）。服务端会将完整的 SFTP 响应消息累积在内存中，若使用足够大（可能

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-94029

Vulnerability Information
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Vulnerability Title
Apache MINA SSHD: Memory exhaustion in SFTP v6 check-file-name/check-file-handle extension
Source: CVE Program / CVE List V5
Vulnerability Description
Server-side memory exhaustion in Apache MINA SSHD 1.0.0 to 2.19.0 and 3.0.0-M1 to 3.0.0-M5, component sshd-sftp, in the SFTP v6 check-file-name/check-file-handle extension. Apache MINA SSHD is a Java library for client-side and server-side SSH. Using a very small "block size" (for instance 256, which is the minimum) on a huge file generates many (file size / block size) hashes. The resulting SFTP reply message was accumulated fully in memory server-side, which could, with a suitably large (possibly sparse) file exhaust the server-side memory, taking down the server. Users are recommended to upgrade to version 2.20.0 or 3.0.0-M6, which fix this issue by imposing a maximum limit on the size of the reply. Many SFTP implementations have a general limit on the size of SFTP messages anyway; typically 256kB as in OpenSSH or also in Apache MINA SSHD.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache MINA SSHD 1.0.0 ~ 2.20.0 -

II. Public POCs for CVE-2026-94029

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III. Intelligence Information for CVE-2026-94029

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Other References for CVE-2026-94029 (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-2026-94053 9.1 CRITICAL Apache MINA SSHD: LDAP injection in sshd-ldap
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-2026-102510 8.7 HIGH Apache PLC4X: Go binding: unbounded allocation and framing failures on wire-controlled len
CVE-2026-102509 8.7 HIGH Apache PLC4X, Apache PLC4X: Pre-authentication resource exhaustion in the OPC UA driver an
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-2026-93996 6.5 MEDIUM Apache MINA SSHD: Memory exhaustion DoS via unbounded SCP command line read
CVE-2026-88920 Apache WSS4J: SAML Sender-Vouches Authentication Bypass
CVE-2026-87830 Apache WSS4J: Streaming WS-SecurityPolicy validation may skip element-protection checks.
CVE-2026-85532 Apache WSS4J: Insufficient Validation of Derived-Key Parameters
CVE-2026-89238 Apache WSS4J: WSS4J EncryptedHeader child confusion causing wrong protected-header selecti
CVE-2026-95616 Apache WSS4J: Unauthenticated denial of service via integer overflow in DER parsing of X.5
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
Same vendor: Apache Software Foundation
Same weakness: CWE-770

V. Comments for CVE-2026-94029

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