CriticalFix available
jupyterlab — security advisory
jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. Prior to 4.5.7, JupyterLab's HTML sanitizer allowlists data-commandlinker-command and data-commandlinker-args on button elements, while CommandLinker listens for all click events on document.body and executes the named command without checking whether the element came from trusted JupyterLab UI. A notebook with a pre-saved HTML cell output containing a deceptive button can trigger arbitrary JupyterLab commands - including arbitrary code execution - on a single user click, without any code being submitted for execution by the user. This vulnerability is fixed in 4.5.7.
- Products
- jupyterlab
- Affected versions
- 4.0.11+ds1+~cs11.25.27-7, 4.0.11+ds1+~cs11.25.27-8, 4.0.11+ds1+~cs11.25.27-9, 4.0.11+ds2+~cs11.25.27-1, 4.0.11+ds2+~cs11.25.27-3, 4.0.11+ds3+~cs11.25.27-1, 4.0.11+ds4+~cs11.25.27-1, 4.0.11+ds4+~cs11.25.27-2, 4.0.11+ds4+~cs11.25.27-3, 4.0.11+ds4+~cs11.25.27-4, 4.0.11+ds5+~cs11.25.27-1, 4.0.13+ds1+~2.0.1+~cs1.4.4-1, 4.1.3+ds1+~2.0.1+~0.15.3+~cs1.4.4-1, 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-1, 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-2, 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-3, 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-4, 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-5, 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-6, 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-7, 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-8, 4.4.1+ds1+~3.0.5+~0.16.6+~cs1.4.4-1, 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-1, 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-2, 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-3, 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-4, 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-5, 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-6, 4.4.8+ds1+~3.1.0+~0.16.6+~cs1.4.4-1
- Fixed versions
- 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-3
- CVEs
- CVE-2026-42557
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:15 UTC · Revision 2
Source evidence
jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. Prior to 4.5.7, JupyterLab's HTML sanitizer allowlists data-commandlinker-command and data-commandlinker-args on button elements, while CommandLinker listens for all click events on document.body and executes the named command without checking whether the element came from trusted JupyterLab UI. A notebook with a pre-saved HTML cell output containing a deceptive button can trigger arbitrary JupyterLab commands - including arbitrary code execution - on a single user click, without any code being submitted for execution by the user. This vulnerability is fixed in 4.5.7.
osv:DEBIAN-CVE-2026-42557
jupyterlab
Fixed versions: Not specified
jupyterlab
Fixed versions: 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-3
Complete source record
{
"id": "205ab787f7d78fae7de8a693196f331e9ef34a732ef72f624d1472aeb0467cbe",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-42557",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-42557",
"summary": "jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. Prior to 4.5.7, JupyterLab's HTML sanitizer allowlists data-commandlinker-command and data-commandlinker-args on button elements, while CommandLinker listens for all click events on document.body and executes the named command without checking whether the element came from trusted JupyterLab UI. A notebook with a pre-saved HTML cell output containing a deceptive button can trigger arbitrary JupyterLab commands - including arbitrary code execution - on a single user click, without any code being submitted for execution by the user. This vulnerability is fixed in 4.5.7.",
"evidence": "osv:DEBIAN-CVE-2026-42557",
"products": [
{
"name": {
"value": "jupyterlab",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.0.11+ds1+~cs11.25.27-7",
"evidence": "/affected/0/versions"
},
{
"value": "4.0.11+ds1+~cs11.25.27-8",
"evidence": "/affected/0/versions"
},
{
"value": "4.0.11+ds1+~cs11.25.27-9",
"evidence": "/affected/0/versions"
},
{
"value": "4.0.11+ds2+~cs11.25.27-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.0.11+ds2+~cs11.25.27-3",
"evidence": "/affected/0/versions"
},
{
"value": "4.0.11+ds3+~cs11.25.27-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.0.11+ds4+~cs11.25.27-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.0.11+ds4+~cs11.25.27-2",
"evidence": "/affected/0/versions"
},
{
"value": "4.0.11+ds4+~cs11.25.27-3",
"evidence": "/affected/0/versions"
},
{
"value": "4.0.11+ds4+~cs11.25.27-4",
"evidence": "/affected/0/versions"
},
{
"value": "4.0.11+ds5+~cs11.25.27-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.0.13+ds1+~2.0.1+~cs1.4.4-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.1.3+ds1+~2.0.1+~0.15.3+~cs1.4.4-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-2",
"evidence": "/affected/0/versions"
},
{
"value": "4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-3",
"evidence": "/affected/0/versions"
},
{
"value": "4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-4",
"evidence": "/affected/0/versions"
},
{
"value": "4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-5",
"evidence": "/affected/0/versions"
},
{
"value": "4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-6",
"evidence": "/affected/0/versions"
},
{
"value": "4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-7",
"evidence": "/affected/0/versions"
},
{
"value": "4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-8",
"evidence": "/affected/0/versions"
},
{
"value": "4.4.1+ds1+~3.0.5+~0.16.6+~cs1.4.4-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-2",
"evidence": "/affected/0/versions"
},
{
"value": "4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-3",
"evidence": "/affected/0/versions"
},
{
"value": "4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-4",
"evidence": "/affected/0/versions"
},
{
"value": "4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-5",
"evidence": "/affected/0/versions"
},
{
"value": "4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-6",
"evidence": "/affected/0/versions"
},
{
"value": "4.4.8+ds1+~3.1.0+~0.16.6+~cs1.4.4-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "jupyterlab",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-3",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "4.0.11+ds1+~cs11.25.27-7",
"evidence": "/affected/1/versions"
},
{
"value": "4.0.11+ds1+~cs11.25.27-8",
"evidence": "/affected/1/versions"
},
{
"value": "4.0.11+ds1+~cs11.25.27-9",
"evidence": "/affected/1/versions"
},
{
"value": "4.0.11+ds2+~cs11.25.27-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.0.11+ds2+~cs11.25.27-3",
"evidence": "/affected/1/versions"
},
{
"value": "4.0.11+ds3+~cs11.25.27-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.0.11+ds4+~cs11.25.27-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.0.11+ds4+~cs11.25.27-2",
"evidence": "/affected/1/versions"
},
{
"value": "4.0.11+ds4+~cs11.25.27-3",
"evidence": "/affected/1/versions"
},
{
"value": "4.0.11+ds4+~cs11.25.27-4",
"evidence": "/affected/1/versions"
},
{
"value": "4.0.11+ds5+~cs11.25.27-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.0.13+ds1+~2.0.1+~cs1.4.4-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.1.3+ds1+~2.0.1+~0.15.3+~cs1.4.4-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-2",
"evidence": "/affected/1/versions"
},
{
"value": "4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-3",
"evidence": "/affected/1/versions"
},
{
"value": "4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-4",
"evidence": "/affected/1/versions"
},
{
"value": "4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-5",
"evidence": "/affected/1/versions"
},
{
"value": "4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-6",
"evidence": "/affected/1/versions"
},
{
"value": "4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-7",
"evidence": "/affected/1/versions"
},
{
"value": "4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-8",
"evidence": "/affected/1/versions"
},
{
"value": "4.4.1+ds1+~3.0.5+~0.16.6+~cs1.4.4-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-2",
"evidence": "/affected/1/versions"
},
{
"value": "4.4.8+ds1+~3.1.0+~0.16.6+~cs1.4.4-1",
"evidence": "/affected/1/versions"
}
]
}
],
"severity": "critical",
"structured": {
"id": "DEBIAN-CVE-2026-42557",
"aliases": [
"DEBIAN-CVE-2026-42557"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "jupyterlab",
"purl": "pkg:deb/debian/jupyterlab?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"4.0.11+ds1+~cs11.25.27-7",
"4.0.11+ds1+~cs11.25.27-8",
"4.0.11+ds1+~cs11.25.27-9",
"4.0.11+ds2+~cs11.25.27-1",
"4.0.11+ds2+~cs11.25.27-3",
"4.0.11+ds3+~cs11.25.27-1",
"4.0.11+ds4+~cs11.25.27-1",
"4.0.11+ds4+~cs11.25.27-2",
"4.0.11+ds4+~cs11.25.27-3",
"4.0.11+ds4+~cs11.25.27-4",
"4.0.11+ds5+~cs11.25.27-1",
"4.0.13+ds1+~2.0.1+~cs1.4.4-1",
"4.1.3+ds1+~2.0.1+~0.15.3+~cs1.4.4-1",
"4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-1",
"4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-2",
"4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-3",
"4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-4",
"4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-5",
"4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-6",
"4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-7",
"4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-8",
"4.4.1+ds1+~3.0.5+~0.16.6+~cs1.4.4-1",
"4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-1",
"4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-2",
"4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-3",
"4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-4",
"4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-5",
"4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-6",
"4.4.8+ds1+~3.1.0+~0.16.6+~cs1.4.4-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42557.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-3"
}
]
}
],
"package": {
"name": "jupyterlab",
"purl": "pkg:deb/debian/jupyterlab?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"4.0.11+ds1+~cs11.25.27-7",
"4.0.11+ds1+~cs11.25.27-8",
"4.0.11+ds1+~cs11.25.27-9",
"4.0.11+ds2+~cs11.25.27-1",
"4.0.11+ds2+~cs11.25.27-3",
"4.0.11+ds3+~cs11.25.27-1",
"4.0.11+ds4+~cs11.25.27-1",
"4.0.11+ds4+~cs11.25.27-2",
"4.0.11+ds4+~cs11.25.27-3",
"4.0.11+ds4+~cs11.25.27-4",
"4.0.11+ds5+~cs11.25.27-1",
"4.0.13+ds1+~2.0.1+~cs1.4.4-1",
"4.1.3+ds1+~2.0.1+~0.15.3+~cs1.4.4-1",
"4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-1",
"4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-2",
"4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-3",
"4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-4",
"4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-5",
"4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-6",
"4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-7",
"4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-8",
"4.4.1+ds1+~3.0.5+~0.16.6+~cs1.4.4-1",
"4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-1",
"4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-2",
"4.4.8+ds1+~3.1.0+~0.16.6+~cs1.4.4-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42557.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-26T11:47:30.022666767Z",
"provider": "osv",
"upstream": [
"CVE-2026-42557"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-42557"
]
},
"related_cves": [
{
"value": "CVE-2026-42557",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 450752,
"published_at": "2026-05-13T16:16:48.167+00:00"
}