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CVE-2026-94029

Updated on 30 Sep 2026

Severity

6.5 Medium severity

Details

CVSS score
6.5
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE ID
Links
NISTCIRCLRHELUbuntu

Overview

About vulnerability

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.

Details

Affected product:
Apache CXF , Spring , Wildfly , activemq , infinispan , jboss-ejb-client , jboss-remoting , jgit , jline , karaf , mina-sshd , org.jboss.resteasy:arquillian-utils , remoting-jmx , resteasy-spring
Affected packages:
sshd-common @ 2.7.0 (+2176 more)