Vulnerability · Published Sep 30, 2026 · Assigned by apache
CVE-2026-94029Apache MINA SSHD: Memory exhaustion in SFTP v6 check-file-name/check-file-handle extension
Medium 6.5
In plain English
A medium-severity resource allocation without limits in Apache MINA SSHD from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities).
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | libmina-sshd-java | no fix listed | DEBIAN-CVE-2026-94029 |
| Debian:14 | libmina-sshd-java | no fix listed | DEBIAN-CVE-2026-94029 |
| Ubuntu:22.04:LTS | mina | no fix listed | UBUNTU-CVE-2026-94029 |
| Ubuntu:24.04:LTS | mina | no fix listed | UBUNTU-CVE-2026-94029 |
| Ubuntu:26.10 | mina2 | no fix listed | UBUNTU-CVE-2026-94029 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache MINA SSHD | 1.0.0 – before 2.20.03.0.0-M1 – before 3.0.0-M6 |
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H