Apache MINA SSHD: Memory exhaustion in SFTP v6 check-file-name/check-file-handle extension (CVE-2026-94029) | HOL Guard CVE

Medium · CVSS 6.5CVE-2026-94029

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

Answer in brief

CVE-2026-94029 records a Medium severity (CVSS 6.5) vulnerability in Apache MINA SSHD: Memory exhaustion in SFTP v6 check-file-name/check-file-handle extension. The current sources do not mark it as known exploited. The current feed maps Apache Software Foundation/org.apache.sshd:sshd-sftp (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 30, 2026Updated Sep 30, 2026Source checked Sep 30, 2026First seen by HOL Sep 30, 2026Material review Sep 30, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.5
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 6.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Apache Software Foundation/org.apache.sshd:sshd-sftp (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Apache Software Foundation/org.apache.sshd:sshd-sftpgeneric	>=1.0.0 <2.20.0 \|\| >=3.0.0-M1 <3.0.0-M6	2.20.0, 3.0.0-M6

Recommended response

Check inventory. Check lockfiles and deployed manifests for Apache Software Foundation/org.apache.sshd:sshd-sftp.
Review the reported fix. Update Apache Software Foundation/org.apache.sshd:sshd-sftp to 2.20.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 30, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.