Medium
mistune — security advisory
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, Include.parse() joins and normalizes user-supplied include paths without verifying that the result remains within the intended markdown directory, allowing crafted include paths to access files outside that directory when markdown files are processed using md.read(). This issue is fixed in version 3.3.0.
- Products
- mistune
- Affected versions
- 0.6-2, 0.7.1-1, 0.7.4-1, 0.8-1, 0.8.1-1, 0.8.3-2, 0.8.4-1, 0.8.4-2, 0.8.4-4, 0.8.4-5, 2.0.0-1+really0.8.4-1, 2.0.4-2, 3.0.2-1, 3.0.2-2, 3.1.3-1, 3.1.4-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-59924
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:48 UTC · Revision 1
Source evidence
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, Include.parse() joins and normalizes user-supplied include paths without verifying that the result remains within the intended markdown directory, allowing crafted include paths to access files outside that directory when markdown files are processed using md.read(). This issue is fixed in version 3.3.0.
osv:UBUNTU-CVE-2026-59924
mistune
Fixed versions: Not specified
mistune
Fixed versions: Not specified
mistune
Fixed versions: Not specified
mistune
Fixed versions: Not specified
mistune
Fixed versions: Not specified
mistune
Fixed versions: Not specified
mistune
Fixed versions: Not specified
mistune
Fixed versions: Not specified
Complete source record
{
"id": "bc940ac5a2837d6d0b7e1608b46f687f8431bd051ed187c359d660fd71a0611d",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-59924",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-59924",
"summary": "Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, Include.parse() joins and normalizes user-supplied include paths without verifying that the result remains within the intended markdown directory, allowing crafted include paths to access files outside that directory when markdown files are processed using md.read(). This issue is fixed in version 3.3.0.",
"evidence": "osv:UBUNTU-CVE-2026-59924",
"products": [
{
"name": {
"value": "mistune",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.6-2",
"evidence": "/affected/0/versions"
},
{
"value": "0.7.1-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "mistune",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.7.4-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.8-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.8.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.8.3-2",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
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"evidence": "/affected/2/package/name"
},
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"affected_versions": [
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "mistune",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "0.8.4-4",
"evidence": "/affected/3/versions"
},
{
"value": "0.8.4-5",
"evidence": "/affected/3/versions"
},
{
"value": "2.0.0-1+really0.8.4-1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
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"evidence": "/affected/4/package/name"
},
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"affected_versions": [
{
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"evidence": "/affected/4/versions"
},
{
"value": "3.0.2-1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "mistune",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "3.0.2-2",
"evidence": "/affected/5/versions"
},
{
"value": "3.1.3-1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "mistune",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "3.1.4-1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "mistune",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.1.3-1",
"evidence": "/affected/7/versions"
},
{
"value": "3.1.4-1",
"evidence": "/affected/7/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-59924",
"aliases": [
"UBUNTU-CVE-2026-59924"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "mistune",
"purl": "pkg:deb/ubuntu/mistune?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"0.6-2",
"0.7.1-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59924.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-mistune",
"binary_version": "0.7.1-1"
},
{
"binary_name": "python3-mistune",
"binary_version": "0.7.1-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "mistune",
"purl": "pkg:deb/ubuntu/mistune?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"0.7.4-1",
"0.8-1",
"0.8.1-1",
"0.8.3-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59924.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-mistune",
"binary_version": "0.8.3-2"
},
{
"binary_name": "python3-mistune",
"binary_version": "0.8.3-2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "mistune",
"purl": "pkg:deb/ubuntu/mistune?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"0.8.4-1",
"0.8.4-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59924.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-mistune",
"binary_version": "0.8.4-2"
}
]
}
},
{
"ranges": [
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],
"package": {
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"purl": "pkg:deb/ubuntu/mistune?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"0.8.4-4",
"0.8.4-5",
"2.0.0-1+really0.8.4-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59924.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-mistune",
"binary_version": "2.0.0-1+really0.8.4-1"
}
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},
{
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],
"package": {
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"purl": "pkg:deb/ubuntu/mistune?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"2.0.4-2",
"3.0.2-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59924.json"
},
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}
]
}
},
{
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],
"package": {
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"purl": "pkg:deb/ubuntu/mistune?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"3.0.2-2",
"3.1.3-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59924.json"
},
"ecosystem_specific": {
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{
"binary_name": "python3-mistune",
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}
]
}
},
{
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}
],
"package": {
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"ecosystem": "Ubuntu:26.10"
},
"versions": [
"3.1.4-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59924.json"
},
"ecosystem_specific": {
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{
"binary_name": "python3-mistune",
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}
]
}
},
{
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"type": "ECOSYSTEM",
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],
"package": {
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"purl": "pkg:deb/ubuntu/mistune?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"3.1.3-1",
"3.1.4-1"
],
"database_specific": {
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},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-mistune",
"binary_version": "3.1.4-1"
}
]
}
}
],
"modified": "2026-10-17T12:59:14.269294701Z",
"provider": "osv",
"upstream": [
"CVE-2026-59924"
],
"references": [
"https://ubuntu.com/security/CVE-2026-59924",
"https://www.cve.org/CVERecord?id=CVE-2026-59924",
"https://github.com/lepture/mistune/security/advisories/GHSA-r4rv-85jg-w4mf"
]
},
"related_cves": [
{
"value": "CVE-2026-59924",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359512,
"published_at": "2026-07-08T17:17:00+00:00"
}