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.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4622-1 advisory.

    - CVE-2026-77185: Asynchronous authentication can bypass signature verification (bsc#1283357).
    - CVE-2026-93994: Repeated-publickey policy bypass on server (bsc#1283352).
    - CVE-2026-93995: Remote execution of JGit 'archive -o=file.zip' can write file on the server     (bsc#1283350).
    - CVE-2026-93996: Memory exhaustion DoS via unbounded SCP command line read (bsc#1283348).
    - CVE-2026-94002: Memory exhaustion in SFTP client via unsolicited SFTP replies (bsc#1283347).
    - CVE-2026-94029: Memory exhaustion in SFTP v6 check-file-name/check-file-handle extension (bsc#1283346).
    - CVE-2026-94052: LDAP password authentication ineffective (bsc#1283345).
    - CVE-2026-94053: LDAP injection in sshd-ldap (bsc#1283344).

    Changes for apache-sshd:

    - Update to upstream version 2.20.0:
     + GH-656 ChannelPipedInputStream: shrink buffer when emptied      + GH-906 Fix finding a signature factory for BC ed25519 keys      + GH-911 Fix server-side SOCKS5 proxy for fragmented and      pipelined CONNECT requests      + Allow asynchronous authentication only for password and      keyboard-interactive authentication schemes      + Fix authentication requiring multiple public keys      (server-side)      + Better argument handling in sshd-git      + More checks in authentication (server-side)      + Better SCP command handling      + SFTP client: simplify response message handling      + Fix check-file-name/check-file-handle SFTP v6 extension      + Improve LDAP authentication (sshd-ldap)
     * New Features      + GH-905 Implement the 'from' and 'expiry-time' options in      authorized_keys handling in public key authentication (server      side)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-94029)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
365326	SUSE SLED15 / SLES15 Security Update : apache-sshd (SUSE-SU-2026:4622-1)	Nessus	SuSE Local Security Checks	Local	critical
351254	Linux Distros Unpatched Vulnerability : CVE-2026-94029	Nessus	Misc.	Local	medium

Detections

Analytics

CVE-2026-94029

medium

Tenable Plugins

critical

medium