CVE-2026-23942

5.4 MEDIUM

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

Published: 2026-03-13 · Last updated: 2026-05-21

Severity and scoring

CVSS: 5.4 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CWE: CWE-22

Affected products

Vendor	Product
erlang	erlang\/otp, erlang\/ssh

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.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-23942
[Vendor advisory]https://cna.erlef.org/cves/CVE-2026-23942.html
[Patch]https://github.com/erlang/otp/commit/27688a824f753d4c16371dc70e88753fb410590b
[Patch]https://github.com/erlang/otp/commit/5ed603a1211b83b8be2d1fc06d3f3bf30c3c9759
[Patch]https://github.com/erlang/otp/commit/9e0ac85d3485e7898e0da88a14be0ee2310a3b28
[Vendor advisory]https://github.com/erlang/otp/security/advisories/GHSA-4749-w85x-hw9h
[Vendor advisory]https://osv.dev/vulnerability/EEF-CVE-2026-23942
[Other]https://www.erlang.org/doc/system/versions.html#order-of-versions

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