DEBIAN-CVE-2026-40110
Jupyter Server is the backend for Jupyter web applications. In versions 2.17.0 and earlier, the Origin header validation uses Python's re.match() to check incoming origins against the allow_origin_pat configuration value. Because re.match() only anchors at the start of the string and does not require a full match, a pattern intended to match only a trusted domain (e.g., trusted.example.com) will also match any origin that begins with that domain followed by additional characters (e.g., trusted.example.com.evil.com). An attacker who controls such a domain can bypass the CORS origin restriction and make cross-origin requests to the Jupyter Server API from an untrusted site. This issue has been fixed in version 2.18.0.
DEBIAN-CVE-2026-40110
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-40110
jupyter-server
Source reference: /affected/0/package/name
- Affected versions
- 1.23.3-1
Source reference:
/affected/0/versions1.23.3-2Source reference:
/affected/0/versions2.14.0-1Source reference:
/affected/0/versions2.14.2-1Source reference:
/affected/0/versions2.14.2-2Source reference:
/affected/0/versions2.14.2-3Source reference:
/affected/0/versions2.14.2-4Source reference:
/affected/0/versions2.14.2-5Source reference:
/affected/0/versions2.15.0-1Source reference:
/affected/0/versions2.17.0-1Source reference:
/affected/0/versions2.20.0-1Source reference:
/affected/0/versions2.20.0-2Source reference:
/affected/0/versions2.20.0-3Source reference:
/affected/0/versions2.9.1-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
jupyter-server
Source reference: /affected/1/package/name
- Affected versions
- 2.15.0-1
Source reference:
/affected/1/versions2.17.0-1Source reference:
/affected/1/versions2.20.0-1Source reference:
/affected/1/versions2.20.0-2Source reference:
/affected/1/versions2.20.0-3Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
jupyter-server
Source reference: /affected/2/package/name
- Affected versions
- 2.15.0-1
Source reference:
/affected/2/versions2.17.0-1Source reference:
/affected/2/versions - Fixed versions
- 2.20.0-1
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "jupyter-server",
"purl": "pkg:deb/debian/jupyter-server?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1.23.3-1",
"1.23.3-2",
"2.14.0-1",
"2.14.2-1",
"2.14.2-2",
"2.14.2-3",
"2.14.2-4",
"2.14.2-5",
"2.15.0-1",
"2.17.0-1",
"2.20.0-1",
"2.20.0-2",
"2.20.0-3",
"2.9.1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40110.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "jupyter-server",
"purl": "pkg:deb/debian/jupyter-server?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"2.15.0-1",
"2.17.0-1",
"2.20.0-1",
"2.20.0-2",
"2.20.0-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40110.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.20.0-1"
}
]
}
],
"package": {
"name": "jupyter-server",
"purl": "pkg:deb/debian/jupyter-server?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"2.15.0-1",
"2.17.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40110.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #56025 · Revision 1
- Added to Heist Feed
- Publisher date