UBUNTU-CVE-2026-102991 (CVE-2026-102991)
Vulnerability from osv_ubuntu – Published: 2026-09-30 20:17 – Updated: 2026-10-08 09:54 – Source website
VLAI
Details
Mako is a template library written in Python. Prior to 1.4.2, on Windows, TemplateLookup.get_template() in mako/lookup.py resolves template URIs with posixpath, while Template.init() in mako/template.py validates them with os.path, which uses ntpath. A URI beginning with a drive designator causes ntpath to absorb the traversal segments before the leading dot-dot check, while posixpath resolution can escape the configured template directory. An application that passes attacker-controlled template names or include paths can disclose process-readable files on the same volume, and a targeted file containing Mako template syntax may also be parsed and executed as a template. Raw URL paths are generally normalized before reaching this form, but query strings, form or JSON bodies, route parameters, and dynamic include expressions can preserve it. This issue is fixed in version 1.4.2.
Severity
6.5 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-mako",
"binary_version": "1.0.3+ds1-1ubuntu1+esm2"
},
{
"binary_name": "python3-mako",
"binary_version": "1.0.3+ds1-1ubuntu1+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "mako",
"purl": "pkg:deb/ubuntu/mako@1.0.3+ds1-1ubuntu1+esm2?arch=source\u0026distro=esm-infra/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.2+ds1-1",
"1.0.3+ds1-1",
"1.0.3+ds1-1ubuntu1",
"1.0.3+ds1-1ubuntu1+esm1",
"1.0.3+ds1-1ubuntu1+esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-mako",
"binary_version": "1.0.7+ds1-1ubuntu0.2+esm1"
},
{
"binary_name": "python3-mako",
"binary_version": "1.0.7+ds1-1ubuntu0.2+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "mako",
"purl": "pkg:deb/ubuntu/mako@1.0.7+ds1-1ubuntu0.2+esm1?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.7+ds1-1",
"1.0.7+ds1-1ubuntu0.2",
"1.0.7+ds1-1ubuntu0.2+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-mako",
"binary_version": "1.1.0+ds1-1ubuntu2.1+esm1"
},
{
"binary_name": "python3-mako",
"binary_version": "1.1.0+ds1-1ubuntu2.1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "mako",
"purl": "pkg:deb/ubuntu/mako@1.1.0+ds1-1ubuntu2.1+esm1?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.7+ds1-1",
"1.1.0+ds1-1",
"1.1.0+ds1-1ubuntu1",
"1.1.0+ds1-1ubuntu2",
"1.1.0+ds1-1ubuntu2.1",
"1.1.0+ds1-1ubuntu2.1+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-mako",
"binary_version": "1.1.3+ds1-2ubuntu0.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "mako",
"purl": "pkg:deb/ubuntu/mako@1.1.3+ds1-2ubuntu0.2?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.1.3+ds1-2",
"1.1.3+ds1-2ubuntu0.1",
"1.1.3+ds1-2ubuntu0.2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-mako",
"binary_version": "1.3.2-1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "mako",
"purl": "pkg:deb/ubuntu/mako@1.3.2-1ubuntu0.1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.2.4+ds-2",
"1.3.1-1",
"1.3.2-1",
"1.3.2-1ubuntu0.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-mako",
"binary_version": "1.3.10-3ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "mako",
"purl": "pkg:deb/ubuntu/mako@1.3.10-3ubuntu0.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.3.9-1",
"1.3.10-3",
"1.3.10-3build1",
"1.3.10-3ubuntu0.1"
]
}
],
"aliases": [],
"details": "Mako is a template library written in Python. Prior to 1.4.2, on Windows, TemplateLookup.get_template() in mako/lookup.py resolves template URIs with posixpath, while Template.__init__() in mako/template.py validates them with os.path, which uses ntpath. A URI beginning with a drive designator causes ntpath to absorb the traversal segments before the leading dot-dot check, while posixpath resolution can escape the configured template directory. An application that passes attacker-controlled template names or include paths can disclose process-readable files on the same volume, and a targeted file containing Mako template syntax may also be parsed and executed as a template. Raw URL paths are generally normalized before reaching this form, but query strings, form or JSON bodies, route parameters, and dynamic include expressions can preserve it. This issue is fixed in version 1.4.2.",
"id": "UBUNTU-CVE-2026-102991",
"modified": "2026-10-08T09:54:46Z",
"published": "2026-09-30T20:17:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-102991"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-102991"
},
{
"type": "REPORT",
"url": "https://github.com/sqlalchemy/mako/security/advisories/GHSA-5639-2j2p-m4mx"
},
{
"type": "REPORT",
"url": "https://github.com/sqlalchemy/mako/issues/441"
},
{
"type": "REPORT",
"url": "https://github.com/sqlalchemy/mako/commit/000ed85e4e48771eff460bf4fc721fb43de80e08"
},
{
"type": "REPORT",
"url": "https://github.com/sqlalchemy/mako/releases/tag/rel_1_4_2"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-102991"
]
}
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Sightings
| Author | Source | Type | Date | Other |
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Nomenclature
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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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