CVE-2026-23942 (GCVE-0-2026-23942)
Vulnerability from cvelistv5
Published
2026-03-13 09:11
Modified
2026-04-07 14:38
Severity ?
5.3 (Medium) - 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
CWE
  • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Summary
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.
References
Impacted products
Vendor Product Version
Erlang OTP Version: 3.0.1
    cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
 Create a notification for this product.
   Erlang OTP Version: 17.0
Version: 0
    cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
 Create a notification for this product.
Show details on NVD website

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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.\\n\\nThis 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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027) vulnerability in Erlang OTP (ssh_sftpd module) allows Path Traversal.\u003cp\u003eThis vulnerability is associated with program files \u003ctt\u003elib/ssh/src/ssh_sftpd.erl\u003c/tt\u003e and program routines \u003ctt\u003essh_sftpd:is_within_root/2\u003c/tt\u003e.\u003c/p\u003e\u003cp\u003eThe SFTP server uses string prefix matching via \u003ctt\u003elists:prefix/2\u003c/tt\u003e 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 \u003ctt\u003e/home/user1\u003c/tt\u003e, paths like \u003ctt\u003e/home/user10\u003c/tt\u003e or \u003ctt\u003e/home/user1_backup\u003c/tt\u003e would incorrectly be considered within the root.\u003c/p\u003e\u003cp\u003eThis 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.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-22\", \"description\": \"CWE-22 Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"The SFTP subsystem must be enabled on the SSH server, the SSH port must be reachable by the attacker, and a root directory must be configured. This is the case when ssh_sftpd is included in the subsystems option with a root parameter and there exist sibling directories sharing the same name prefix as the root.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"The SFTP subsystem must be enabled on the SSH server, the SSH port must be reachable by the attacker, and a root directory must be configured. This is the case when \u003ctt\u003essh_sftpd\u003c/tt\u003e is included in the \u003ctt\u003esubsystems\u003c/tt\u003e option with a \u003ctt\u003eroot\u003c/tt\u003e parameter and there exist sibling directories sharing the same name prefix as the root.\", \"base64\": false}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"26.2.5.18\"}, {\"criteria\": \"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"27.3.4.9\", \"versionStartIncluding\": \"27.0\"}, {\"criteria\": \"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"28.4.1\", \"versionStartIncluding\": \"28.0\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-04-07T14:38:09.705Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-23942\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-07T14:38:09.705Z\", \"dateReserved\": \"2026-01-19T14:23:14.343Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-03-13T09:11:56.424Z\", \"assignerShortName\": \"EEF\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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