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Fencer Intel
medium 6.5

CVE-2026-94029 json

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

published last mo. modified last mo. also EUVD-2026-89731

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 25%
public exploits
0
none known

Summary

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.

Patch / fix

  • Apache Software Foundation Apache MINA SSHD 2.20.0, 3.0.0-M6
  • libmina-sshd-java Debian 14 2.20.1-1

debian advisories DEBIAN-CVE-2026-94029

  • apache-sshd SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 2.20.0-150200.5.19.1

suse advisories SUSE-SU-2026:4622-1

  • apache-sshd openSUSE Tumbleweed 2.20.0-1.1

opensuse advisories openSUSE-SU-2026:11940-1

Is CVE-2026-94029 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-94029 updated cvss 6.5

org.apache.sshd/sshd-sftp: Apache MINA SSHD: Denial of Service via memory exhaustion in SFTP check-file extension

  • Red Hat build of Apache Camel 4 for Quarkus 3 sshd-sftp 2.17.1.redhat-00001 Red Hat build of Apache Camel for Spring Boot 4 sshd-sftp 2.17.1.redhat-00001
    affected: workaround, no fix available “Fix deferred”
  • Red Hat build of Apicurio Registry 3 sshd-sftp 2.17.1.redhat-00001 Red Hat Fuse 7 sshd-sftp 2.17.1.redhat-00001
    affected: workaround, no fix planned “Out of support scope”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
last mo.

Exploit prediction

0.32% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Apache Software Foundation Apache MINA SSHD

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.