5.4

CVE-2026-23942

SFTP root escape via component-agnostic prefix check in ssh_sftpd

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Erlang ≫ Erlang/otp Version >= 17.0 < 26.2.5.18
Erlang ≫ Erlang/otp Version >= 27.0 < 27.3.4.9
Erlang ≫ Erlang/otp Version >= 28.0 < 28.4.1
Erlang ≫ Erlang/ssh Version >= 3.0.1 < 5.1.4.14
Erlang ≫ Erlang/ssh Version >= 5.2 < 5.2.11.6
Erlang ≫ Erlang/ssh Version >= 5.5 <= 5.5.1
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.36% 0.279
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.4 2.8 2.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
6b3ad84c-e1a6-4bf7-a703-f496b71e49db 5.3 0 0
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

https://www.erlang.org/doc/system/versions.html#order-of-versions
Product
https://github.com/erlang/otp/security/advisories/GHSA-4749-w85x-hw9h
Vendor Advisory
Mitigation
https://github.com/erlang/otp/commit/27688a824f753d4c16371dc70e88753fb410590b
Patch
https://github.com/erlang/otp/commit/9e0ac85d3485e7898e0da88a14be0ee2310a3b28
Patch
https://github.com/erlang/otp/commit/5ed603a1211b83b8be2d1fc06d3f3bf30c3c9759
Patch
https://cna.erlef.org/cves/CVE-2026-23942.html
Vendor Advisory
https://osv.dev/vulnerability/EEF-CVE-2026-23942
Vendor Advisory