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Description

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 until OTP 28.4.1, OTP 27.3.4.9 and OTP 26.2.5.18, corresponding to ssh from 3.0.1 until 5.5.1, 5.2.11.6 and 5.1.4.14.

PUBLISHED Reserved 2026-01-19 | Published 2026-03-13 | Updated 2026-03-13 | Assigner EEF




MEDIUM: 5.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Problem types

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Product status

Default status
unknown

3.0.1 (otp) before *
affected

pkg:otp/ssh@3.0.1 (purl) before pkg:otp/ssh@*
affected

Default status
unknown

17.0 (otp) before *
affected

Any version before *
affected

Credits

Luigino Camastra / Aisle Research reporter

Jakub Witczak remediation developer

Michał Wąsowski remediation reviewer

References

github.com/...ng/otp/security/advisories/GHSA-4749-w85x-hw9h vendor-advisory

www.erlang.org/doc/system/versions.html

github.com/...ommit/27688a824f753d4c16371dc70e88753fb410590b patch

github.com/...ommit/9e0ac85d3485e7898e0da88a14be0ee2310a3b28 patch

github.com/...ommit/5ed603a1211b83b8be2d1fc06d3f3bf30c3c9759 patch

cve.org (CVE-2026-23942)

nvd.nist.gov (CVE-2026-23942)

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