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CVE-2026-94029

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

CVSS 3.1 6.5 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-94029

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-94029

Published

org.apache.sshd:sshd-sftp

https://repo.maven.apache.org/maven2

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Apache Software Foundation",
                    "product": "Apache MINA SSHD",
                    "packageURL": "pkg:maven/org.apache.sshd/sshd-sftp",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "1.0.0",
                            "lessThan": "2.20.0",
                            "versionType": "maven"
                        },
                        {
                            "status": "affected",
                            "version": "3.0.0-M1",
                            "lessThan": "3.0.0-M6",
                            "versionType": "maven"
                        }
                    ],
                    "defaultStatus": "unaffected",
                    "collectionURL": "https://repo.maven.apache.org/maven2",
                    "packageName": "org.apache.sshd:sshd-sftp"
                }

Original source record · Cite this exact observation · Complete original publisher JSON