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VulnerabilityPublished

CVE-2026-94029: Apache MINA SSHD · Unthrottled Resource Allocation

Affects Apache MINA SSHDSource CVE Database V5

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Not known to be exploited · CVSS 6.5 Medium : upgrade to 3.0.0-M6 or 2.20.0 when convenient.

Data as of 13 Nov 2026, 23:54 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 25% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 3.0.0-M6, 2.20.0
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 30 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Upgrade Apache to 3.0.0-M6 or 2.20.0.

Affected software

ProductAffectedFixed in
Apache Software FoundationApache MINA SSHDAffected
  • >=3.0.0-M1 <3.0.0-M6
Fixed in
  • 3.0.0-M6
Apache Software FoundationApache MINA SSHDAffected
  • >=1.0.0 <2.20.0
Fixed in
  • 2.20.0
MavenApache Software Foundation/org.apache.sshd:sshd-sftppkg:maven/Apache Software Foundation/org.apache.sshd:sshd-sftpOther threatsAffected
  • >=1.0.0 <2.20.0
  • >=3.0.0-M1 <3.0.0-M6
Fixed in
  • 2.20.0
  • 3.0.0-M6

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Users should upgrade Apache MINA SSHD to version 2.20.0 or later, or to version 3.0.0-M6 or later, where the vulnerability is fixed by imposing a maximum limit on the size of the SFTP reply message. This official fix effectively mitigates the risk of memory exhaustion. No additional mitigation actions are indicated by the vendor advisory.

Description

CVE-2026-94029 is a server-side memory exhaustion vulnerability in Apache MINA SSHD affecting versions from 1.0.0 up to but not including 2.20.0 and from 3.0.0-M1 up to but not including 3.0.0-M6. The flaw exists in the sshd-sftp component during the SFTP v6 check-file-name/check-file-handle extension. Using a very small block size on a large file causes the server to accumulate a large reply message fully in memory, potentially exhausting server memory and causing a denial of service. The issue is fixed in versions 2.20.0 and 3.0.0-M6 by imposing a maximum limit on the size of the reply message.

References

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