ubuntu-cve-2026-61632
Vulnerability from osv_ubuntu
Published
2026-08-07 00:00
Modified
2026-08-07 00:00
Summary
Details
PyMdown Extensions is a set of extensions for the Python-Markdown markdown project. In versions up to and including 10.21.3, the b64 extension is vulnerable to a path traversal that discloses arbitrary files: it inlines images referenced by by joining the src onto the configured base_path with os.path.normpath and opening the result directly, without verifying that the resolved path stays inside base_path. As a result, an src containing ../ sequences or an absolute path reads a file outside base_path as long as it has an allowed image extension (.png, .jpg, .jpeg, .gif, .svg), and the file's contents are then base64-encoded into the rendered output, disclosing them. An application that renders untrusted Markdown with pymdownx.b64 enabled can therefore leak the contents of image-extension files readable by the process to whoever controls the Markdown or views the output, a targeted file-read bounded by the extension check. This issue has been fixed in version 11.0.
Severity
5.3 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-markdown",
"binary_version": "2.4-1ubuntu0.14.04.1"
},
{
"binary_name": "python3-markdown",
"binary_version": "2.4-1ubuntu0.14.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:14.04:LTS",
"name": "python-markdown",
"purl": "pkg:deb/ubuntu/python-markdown@2.4-1ubuntu0.14.04.1?arch=source\u0026distro=trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.3.1-1",
"2.3.1-2",
"2.4-1",
"2.4-1ubuntu0.14.04.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "markdown",
"binary_version": "1.0.1-8"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "markdown",
"purl": "pkg:deb/ubuntu/markdown@1.0.1-8?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.1-7",
"1.0.1-8"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-markdown",
"binary_version": "2.6.6-1"
},
{
"binary_name": "python3-markdown",
"binary_version": "2.6.6-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "python-markdown",
"purl": "pkg:deb/ubuntu/python-markdown@2.6.6-1?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.6.2-1",
"2.6.3-1",
"2.6.4-1",
"2.6.5-1",
"2.6.5-2",
"2.6.6-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "markdown",
"binary_version": "1.0.1-10"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "markdown",
"purl": "pkg:deb/ubuntu/markdown@1.0.1-10?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.1-9",
"1.0.1-10"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-markdown",
"binary_version": "2.6.9-1"
},
{
"binary_name": "python3-markdown",
"binary_version": "2.6.9-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "python-markdown",
"purl": "pkg:deb/ubuntu/python-markdown@2.6.9-1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.6.9-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-markdown",
"binary_version": "3.1.1-3"
},
{
"binary_name": "python3-markdown",
"binary_version": "3.1.1-3"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "python-markdown",
"purl": "pkg:deb/ubuntu/python-markdown@3.1.1-3?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.1.1-2",
"3.1.1-2build1",
"3.1.1-3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "markdown",
"binary_version": "1.0.1-10"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "markdown",
"purl": "pkg:deb/ubuntu/markdown@1.0.1-10?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.1-10"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "markdown",
"binary_version": "1.0.1-10.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "markdown",
"purl": "pkg:deb/ubuntu/markdown@1.0.1-10.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.1-10.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-markdown",
"binary_version": "3.3.6-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "python-markdown",
"purl": "pkg:deb/ubuntu/python-markdown@3.3.6-1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.3.4-1",
"3.3.6-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "markdown",
"binary_version": "1.0.1-12"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "markdown",
"purl": "pkg:deb/ubuntu/markdown@1.0.1-12?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.1-12"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-markdown",
"binary_version": "3.5.2-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "python-markdown",
"purl": "pkg:deb/ubuntu/python-markdown@3.5.2-1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.4.4-1",
"3.5.2-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "markdown",
"binary_version": "1.0.1-14"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "markdown",
"purl": "pkg:deb/ubuntu/markdown@1.0.1-14?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.1-14"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-markdown",
"binary_version": "3.10.2-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "python-markdown",
"purl": "pkg:deb/ubuntu/python-markdown@3.10.2-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.8.2-2",
"3.10-1",
"3.10-2",
"3.10.2-1"
]
}
],
"aliases": [],
"details": "PyMdown Extensions is a set of extensions for the Python-Markdown markdown project. In versions up to and including 10.21.3, the b64 extension is vulnerable to a path traversal that discloses arbitrary files: it inlines images referenced by \u003cimg src=\"...\"\u003e by joining the src onto the configured base_path with os.path.normpath and opening the result directly, without verifying that the resolved path stays inside base_path. As a result, an src containing ../ sequences or an absolute path reads a file outside base_path as long as it has an allowed image extension (.png, .jpg, .jpeg, .gif, .svg), and the file\u0027s contents are then base64-encoded into the rendered output, disclosing them. An application that renders untrusted Markdown with pymdownx.b64 enabled can therefore leak the contents of image-extension files readable by the process to whoever controls the Markdown or views the output, a targeted file-read bounded by the extension check. This issue has been fixed in version 11.0.",
"id": "UBUNTU-CVE-2026-61632",
"modified": "2026-08-07T00:00:00Z",
"published": "2026-08-07T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-61632"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-61632"
},
{
"type": "REPORT",
"url": "https://github.com/facelessuser/pymdown-extensions/releases/tag/11.0"
},
{
"type": "REPORT",
"url": "https://github.com/facelessuser/pymdown-extensions/security/advisories/GHSA-9xwg-3r6f-jcx2"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-61632"
]
}
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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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