CVE-2026-23942 Affecting erlang package, versions <1:25.2.3+dfsg-1+deb12u4


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.36% (28th percentile)

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  • Snyk IDSNYK-ECHOLATEST-ERLANG-18353406
  • published28 Jul 2026
  • disclosed13 Mar 2026

Introduced: 13 Mar 2026

CVE-2026-23942  (opens in a new tab)

How to fix?

Upgrade Echo:latest erlang to version 1:25.2.3+dfsg-1+deb12u4 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream erlang package and not the erlang package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Erlang OTP (ssh_sftpd module) allows Path Traversal.

This vulnerability is associated with program files lib/ssh/src/ssh_sftpd.erl and program routines ssh_sftpd:is_within_root/2.

The SFTP server uses string prefix matching via lists:prefix/2 rather than proper path component validation when checking if a path is within the configured root directory. This allows authenticated users to access sibling directories that share a common name prefix with the configured root directory. For example, if root is set to /home/user1, paths like /home/user10 or /home/user1_backup would incorrectly be considered within the root.

This issue affects OTP from OTP 17.0 before OTP 28.4.1, OTP 27.3.4.9 and OTP 26.2.5.18, corresponding to ssh from 3.0.1 before 5.5.1, 5.2.11.6 and 5.1.4.14.

CVSS Base Scores

version 3.1