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

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-94029

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-94029

Apache MINA SSHD

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "Apache Software Foundation",
    "product": "Apache MINA SSHD",
    "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"
      }
    ],
    "packageURL": "pkg:maven/org.apache.sshd/sshd-sftp",
    "packageName": "org.apache.sshd:sshd-sftp",
    "collectionURL": "https://repo.maven.apache.org/maven2",
    "defaultStatus": "unaffected"
  }
]
Related CVEs
CVE-2026-94029

Source reference: /cveMetadata/cveId

Publisher severity

medium

Source reference: /containers/cna/metrics

Event
#4859 · Revision 1
Added to Heist Feed
Publisher date
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