jupyter-notebook — security advisory
In Jupyter Notebook versions 7.0.0 through 7.5.5, JupyterLab versions 4.5.6 and earlier, and the corresponding @jupyter-notebook/help-extension and @jupyterlab/help-extension packages before 7.5.6 and 4.5.7, a stored cross-site scripting issue in the help command linker can be chained with attacker-controlled notebook content to steal authentication tokens with a single click. An attacker can craft a malicious notebook file containing elements that appear indistinguishable from legitimate controls and trigger execution when a user interacts with them. Successful exploitation allows theft of the user's authentication token and complete takeover of the Jupyter session through the REST API, including reading files, creating or modifying files, accessing kernels to execute arbitrary code, and creating terminals for shell access. This issue has been fixed in Notebook 7.5.6, JupyterLab 4.5.7, @jupyter-notebook/help-extension 7.5.6, and @jupyterlab/help-extension 4.5.7. As a workaround, disable the affected help extensions or set allowCommandLinker to false in the sanitizer configuration.
- Products
- jupyter-notebook
- Affected versions
- 4.2.3-4, 5.1.0-2, 5.2.1-2, 5.2.2-1, 5.2.2-1ubuntu0.1, 5.7.8-1, 6.0.0-1, 6.0.0-2, 6.0.2-1, 6.0.3-1, 6.0.3-2, 6.0.3-2ubuntu0.1, 6.2.0-1, 6.4.12-2.2, 6.4.12-2.2ubuntu1, 6.4.12-2.2ubuntu1+esm1, 6.4.13-5, 6.4.13-5ubuntu0.1, 6.4.5-2, 6.4.5-3, 6.4.5-4, 6.4.8-1, 6.4.8-1ubuntu0.1, 6.4.8-1ubuntu0.1+esm1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-40171
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:02 UTC · Revision 1
Source evidence
In Jupyter Notebook versions 7.0.0 through 7.5.5, JupyterLab versions 4.5.6 and earlier, and the corresponding @jupyter-notebook/help-extension and @jupyterlab/help-extension packages before 7.5.6 and 4.5.7, a stored cross-site scripting issue in the help command linker can be chained with attacker-controlled notebook content to steal authentication tokens with a single click. An attacker can craft a malicious notebook file containing elements that appear indistinguishable from legitimate controls and trigger execution when a user interacts with them. Successful exploitation allows theft of the user's authentication token and complete takeover of the Jupyter session through the REST API, including reading files, creating or modifying files, accessing kernels to execute arbitrary code, and creating terminals for shell access. This issue has been fixed in Notebook 7.5.6, JupyterLab 4.5.7, @jupyter-notebook/help-extension 7.5.6, and @jupyterlab/help-extension 4.5.7. As a workaround, disable the affected help extensions or set allowCommandLinker to false in the sanitizer configuration.
osv:UBUNTU-CVE-2026-40171
jupyter-notebook
Fixed versions: Not specified
jupyter-notebook
Fixed versions: Not specified
jupyter-notebook
Fixed versions: Not specified
jupyter-notebook
Fixed versions: Not specified
jupyter-notebook
Fixed versions: Not specified
jupyter-notebook
Fixed versions: Not specified
jupyter-notebook
Fixed versions: Not specified
Complete source record
{
"id": "f6225df4b4df46e356a381caf54ec5a88062e6c5d2df1a8dee4e0ad1ba46105b",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-40171",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-40171",
"summary": "In Jupyter Notebook versions 7.0.0 through 7.5.5, JupyterLab versions 4.5.6 and earlier, and the corresponding @jupyter-notebook/help-extension and @jupyterlab/help-extension packages before 7.5.6 and 4.5.7, a stored cross-site scripting issue in the help command linker can be chained with attacker-controlled notebook content to steal authentication tokens with a single click. An attacker can craft a malicious notebook file containing elements that appear indistinguishable from legitimate controls and trigger execution when a user interacts with them. Successful exploitation allows theft of the user's authentication token and complete takeover of the Jupyter session through the REST API, including reading files, creating or modifying files, accessing kernels to execute arbitrary code, and creating terminals for shell access. This issue has been fixed in Notebook 7.5.6, JupyterLab 4.5.7, @jupyter-notebook/help-extension 7.5.6, and @jupyterlab/help-extension 4.5.7. As a workaround, disable the affected help extensions or set allowCommandLinker to false in the sanitizer configuration.",
"evidence": "osv:UBUNTU-CVE-2026-40171",
"products": [
{
"name": {
"value": "jupyter-notebook",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.2.3-4",
"evidence": "/affected/0/versions"
},
{
"value": "5.1.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "5.2.1-2",
"evidence": "/affected/0/versions"
},
{
"value": "5.2.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "5.2.2-1ubuntu0.1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "jupyter-notebook",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.7.8-1",
"evidence": "/affected/1/versions"
},
{
"value": "6.0.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "6.0.0-2",
"evidence": "/affected/1/versions"
},
{
"value": "6.0.2-1",
"evidence": "/affected/1/versions"
},
{
"value": "6.0.3-1",
"evidence": "/affected/1/versions"
},
{
"value": "6.0.3-2",
"evidence": "/affected/1/versions"
},
{
"value": "6.0.3-2ubuntu0.1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "jupyter-notebook",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.2.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "6.4.5-2",
"evidence": "/affected/2/versions"
},
{
"value": "6.4.5-3",
"evidence": "/affected/2/versions"
},
{
"value": "6.4.5-4",
"evidence": "/affected/2/versions"
},
{
"value": "6.4.8-1",
"evidence": "/affected/2/versions"
},
{
"value": "6.4.8-1ubuntu0.1",
"evidence": "/affected/2/versions"
},
{
"value": "6.4.8-1ubuntu0.1+esm1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "jupyter-notebook",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.4.12-2.2",
"evidence": "/affected/3/versions"
},
{
"value": "6.4.12-2.2ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "6.4.12-2.2ubuntu1+esm1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "jupyter-notebook",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.4.13-5",
"evidence": "/affected/4/versions"
},
{
"value": "6.4.13-5ubuntu0.1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "jupyter-notebook",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.4.13-5ubuntu0.1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "jupyter-notebook",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.4.13-5ubuntu0.1",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-40171",
"aliases": [
"UBUNTU-CVE-2026-40171"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "jupyter-notebook",
"purl": "pkg:deb/ubuntu/jupyter-notebook?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"4.2.3-4",
"5.1.0-2",
"5.2.1-2",
"5.2.2-1",
"5.2.2-1ubuntu0.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40171.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "jupyter-notebook",
"binary_version": "5.2.2-1ubuntu0.1"
},
{
"binary_name": "python-notebook",
"binary_version": "5.2.2-1ubuntu0.1"
},
{
"binary_name": "python3-notebook",
"binary_version": "5.2.2-1ubuntu0.1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "jupyter-notebook",
"purl": "pkg:deb/ubuntu/jupyter-notebook?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"5.7.8-1",
"6.0.0-1",
"6.0.0-2",
"6.0.2-1",
"6.0.3-1",
"6.0.3-2",
"6.0.3-2ubuntu0.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40171.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "jupyter-notebook",
"binary_version": "6.0.3-2ubuntu0.1"
},
{
"binary_name": "python3-notebook",
"binary_version": "6.0.3-2ubuntu0.1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "jupyter-notebook",
"purl": "pkg:deb/ubuntu/jupyter-notebook?arch=source&distro=esm-apps%2Fjammy",
"ecosystem": "Ubuntu:Pro:22.04:LTS"
},
"versions": [
"6.2.0-1",
"6.4.5-2",
"6.4.5-3",
"6.4.5-4",
"6.4.8-1",
"6.4.8-1ubuntu0.1",
"6.4.8-1ubuntu0.1+esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40171.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "jupyter-notebook",
"binary_version": "6.4.8-1ubuntu0.1+esm1"
},
{
"binary_name": "python3-notebook",
"binary_version": "6.4.8-1ubuntu0.1+esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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}
]
}
],
"package": {
"name": "jupyter-notebook",
"purl": "pkg:deb/ubuntu/jupyter-notebook?arch=source&distro=esm-apps%2Fnoble",
"ecosystem": "Ubuntu:Pro:24.04:LTS"
},
"versions": [
"6.4.12-2.2",
"6.4.12-2.2ubuntu1",
"6.4.12-2.2ubuntu1+esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40171.json"
},
"ecosystem_specific": {
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"binary_name": "jupyter-notebook",
"binary_version": "6.4.12-2.2ubuntu1+esm1"
},
{
"binary_name": "python3-notebook",
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},
{
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"ecosystem": "Ubuntu:26.10"
},
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},
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},
{
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},
"versions": [
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],
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},
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{
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},
{
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}
]
}
}
],
"modified": "2026-10-17T13:00:03.921768848Z",
"provider": "osv",
"upstream": [
"CVE-2026-40171"
],
"references": [
"https://ubuntu.com/security/CVE-2026-40171",
"https://www.cve.org/CVERecord?id=CVE-2026-40171"
]
},
"related_cves": [
{
"value": "CVE-2026-40171",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 360236,
"published_at": "2026-05-06T20:16:00+00:00"
}