UBUNTU-CVE-2026-54552 (CVE-2026-54552)
Vulnerability from osv_ubuntu – Published: 2026-08-18 18:18 – Updated: 2026-09-23 23:31 – Source website
VLAI
Details
sh provides Python process launching. Prior to 2.2.4, the _uid option in sh.py performs an incomplete privilege drop on Linux and Unix-like systems. When sh runs from an elevated process and launches a command with _uid set to an unprivileged user, the child changes its UID but can retain the parent process's supplementary groups because the privilege-drop sequence does not fully establish the target user's UID, primary GID, and supplementary groups. The child can therefore retain access to files or resources granted to privileged groups such as root, docker, disk, shadow, or sudo, violating the expected _uid privilege boundary. This issue is fixed in version 2.2.4.
Severity
7.9 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-sh",
"binary_version": "1.11-1"
},
{
"binary_name": "python3-sh",
"binary_version": "1.11-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "python-sh",
"purl": "pkg:deb/ubuntu/python-sh@1.11-1?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.11-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-sh",
"binary_version": "1.11-1"
},
{
"binary_name": "python3-sh",
"binary_version": "1.11-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "python-sh",
"purl": "pkg:deb/ubuntu/python-sh@1.11-1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.11-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-sh",
"binary_version": "1.12.14-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "python-sh",
"purl": "pkg:deb/ubuntu/python-sh@1.12.14-2?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.12.14-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-sh",
"binary_version": "1.14.2-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "python-sh",
"purl": "pkg:deb/ubuntu/python-sh@1.14.2-1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.14.1-1",
"1.14.2-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-sh",
"binary_version": "1.14.2-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "python-sh",
"purl": "pkg:deb/ubuntu/python-sh@1.14.2-1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.14.2-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-sh",
"binary_version": "2.2.1-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "python-sh",
"purl": "pkg:deb/ubuntu/python-sh@2.2.1-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.2.1-1"
]
}
],
"aliases": [],
"details": "sh provides Python process launching. Prior to 2.2.4, the _uid option in sh.py performs an incomplete privilege drop on Linux and Unix-like systems. When sh runs from an elevated process and launches a command with _uid set to an unprivileged user, the child changes its UID but can retain the parent process\u0027s supplementary groups because the privilege-drop sequence does not fully establish the target user\u0027s UID, primary GID, and supplementary groups. The child can therefore retain access to files or resources granted to privileged groups such as root, docker, disk, shadow, or sudo, violating the expected _uid privilege boundary. This issue is fixed in version 2.2.4.",
"id": "UBUNTU-CVE-2026-54552",
"modified": "2026-09-23T23:31:22Z",
"published": "2026-08-18T18:18:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-54552"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-54552"
},
{
"type": "REPORT",
"url": "https://github.com/amoffat/sh/security/advisories/GHSA-q38v-wp89-2w55"
},
{
"type": "REPORT",
"url": "https://github.com/amoffat/sh/pull/776"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-54552"
]
}
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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
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- Confirmed: The vulnerability has been validated from an analyst's perspective.
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- Not confirmed: The user expressed doubt about the validity of the vulnerability.
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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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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