Allocation of Resources Without Limits or Throttling Affecting org.apache.sshd:sshd-sftp package, versions [1.0.0,2.20.0)[3.0.0-M1,3.0.0-M6)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published26 Oct 2026
- disclosed30 Sept 2026
- creditHo1aAs
Introduced: 30 Sep 2026
NewCVE-2026-94029 (opens in a new tab)How to fix?
Upgrade org.apache.sshd:sshd-sftp to version 2.20.0, 3.0.0-M6 or higher.
Overview
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via the SFTP v6 check-file-name/check-file-handle extension in AbstractSftpSubsystemHelper. An attacker can exhaust server memory and take down the SFTP server by requesting hashes for a huge (possibly sparse) file with a very small block size, causing the server to accumulate an excessive number of hashes in the reply buffer.
Notes
- Reaching the server-side hash processing requires an authenticated SFTP user with low privileges