ubuntu-cve-2026-23942
Vulnerability from osv_ubuntu
Published
2026-03-13 19:54
Modified
2026-07-29 07:54
Summary
Details
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.
Severity
5.4 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
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"binary_version": "1:27.3.4.1+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-ssh",
"binary_version": "1:27.3.4.1+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-ssl",
"binary_version": "1:27.3.4.1+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-syntax-tools",
"binary_version": "1:27.3.4.1+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-tftp",
"binary_version": "1:27.3.4.1+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-tools",
"binary_version": "1:27.3.4.1+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-wx",
"binary_version": "1:27.3.4.1+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-x11",
"binary_version": "1:27.3.4.1+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-xmerl",
"binary_version": "1:27.3.4.1+dfsg-1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "erlang",
"purl": "pkg:deb/ubuntu/erlang@1:27.3.4.1+dfsg-1ubuntu0.1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:27.3+dfsg-1ubuntu1",
"1:27.3+dfsg-1ubuntu1.1",
"1:27.3.4.1+dfsg-1",
"1:27.3.4.1+dfsg-1build1",
"1:27.3.4.1+dfsg-1ubuntu0.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "erlang",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-asn1",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-base",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-common-test",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-crypto",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-debugger",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-dialyzer",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-diameter",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-edoc",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-eldap",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-et",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-eunit",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-examples",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-ftp",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-inets",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-jinterface",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-megaco",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-mnesia",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-mode",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-nox",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-observer",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-odbc",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-os-mon",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-parsetools",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-public-key",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-reltool",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-runtime-tools",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-snmp",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-src",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-ssh",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-ssl",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-syntax-tools",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-tftp",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-tools",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-wx",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-x11",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-xmerl",
"binary_version": "1:27.3.4.6+dfsg-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "erlang",
"purl": "pkg:deb/ubuntu/erlang@1:27.3.4.6+dfsg-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:27.3.4.1+dfsg-1build1",
"1:27.3.4.3+dfsg-1",
"1:27.3.4.4+dfsg-1",
"1:27.3.4.6+dfsg-1"
]
}
],
"aliases": [],
"details": "Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027) 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\u00a028.4.1, OTP\u00a027.3.4.9 and OTP\u00a026.2.5.18, corresponding to ssh from 3.0.1 before 5.5.1, 5.2.11.6 and 5.1.4.14.",
"id": "UBUNTU-CVE-2026-23942",
"modified": "2026-07-29T07:54:24Z",
"published": "2026-03-13T19:54:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-23942"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-23942"
},
{
"type": "REPORT",
"url": "https://github.com/erlang/otp/security/advisories/GHSA-4749-w85x-hw9h"
},
{
"type": "REPORT",
"url": "https://github.com/erlang/otp/commit/27688a824f753d4c16371dc70e88753fb410590b"
},
{
"type": "REPORT",
"url": "https://github.com/erlang/otp/commit/5ed603a1211b83b8be2d1fc06d3f3bf30c3c9759"
},
{
"type": "REPORT",
"url": "https://github.com/erlang/otp/commit/9e0ac85d3485e7898e0da88a14be0ee2310a3b28"
},
{
"type": "REPORT",
"url": "https://www.erlang.org/doc/system/versions.html#order-of-versions"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-23942"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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