Low
jupyterhub — security advisory
JupyterHub through 6.0.1 contains an identifier collision vulnerability that allows authenticated users to overwrite another user's named-server OAuth client by registering a hyphenated username. Attackers holding a name like alice-prod can overwrite the client for alice's server prod, breaking OAuth login and revoking tokens by stopping their own server.
- Products
- jupyterhub
- Affected versions
- 3.0.0+ds1-1, 5.0.0+ds1-1, 5.0.0+ds1-2, 5.0.0+ds1-3, 5.0.0+ds1-4, 5.2.1+ds1-1, 5.2.1+ds1-2, 5.2.1+ds1-3, 5.2.1+ds1-4, 5.2.1+ds1-5
- Fixed versions
- Not specified
- CVEs
- CVE-2026-108752
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 23:15 UTC · Revision 1
Source evidence
JupyterHub through 6.0.1 contains an identifier collision vulnerability that allows authenticated users to overwrite another user's named-server OAuth client by registering a hyphenated username. Attackers holding a name like alice-prod can overwrite the client for alice's server prod, breaking OAuth login and revoking tokens by stopping their own server.
osv:DEBIAN-CVE-2026-108752
jupyterhub
Fixed versions: Not specified
jupyterhub
Fixed versions: Not specified
jupyterhub
Fixed versions: Not specified
Complete source record
{
"id": "41718eb6b8e919f963bc2fa45bd2963101c1dcdb7fe41ddf81c754b5adc273ff",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-108752",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-108752",
"summary": "JupyterHub through 6.0.1 contains an identifier collision vulnerability that allows authenticated users to overwrite another user's named-server OAuth client by registering a hyphenated username. Attackers holding a name like alice-prod can overwrite the client for alice's server prod, breaking OAuth login and revoking tokens by stopping their own server.",
"evidence": "osv:DEBIAN-CVE-2026-108752",
"products": [
{
"name": {
"value": "jupyterhub",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.0.0+ds1-1",
"evidence": "/affected/0/versions"
},
{
"value": "5.0.0+ds1-1",
"evidence": "/affected/0/versions"
},
{
"value": "5.0.0+ds1-2",
"evidence": "/affected/0/versions"
},
{
"value": "5.0.0+ds1-3",
"evidence": "/affected/0/versions"
},
{
"value": "5.0.0+ds1-4",
"evidence": "/affected/0/versions"
},
{
"value": "5.2.1+ds1-1",
"evidence": "/affected/0/versions"
},
{
"value": "5.2.1+ds1-2",
"evidence": "/affected/0/versions"
},
{
"value": "5.2.1+ds1-3",
"evidence": "/affected/0/versions"
},
{
"value": "5.2.1+ds1-4",
"evidence": "/affected/0/versions"
},
{
"value": "5.2.1+ds1-5",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "jupyterhub",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.2.1+ds1-4",
"evidence": "/affected/1/versions"
},
{
"value": "5.2.1+ds1-5",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "jupyterhub",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.2.1+ds1-4",
"evidence": "/affected/2/versions"
},
{
"value": "5.2.1+ds1-5",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "low",
"structured": {
"id": "DEBIAN-CVE-2026-108752",
"aliases": [
"DEBIAN-CVE-2026-108752"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "jupyterhub",
"purl": "pkg:deb/debian/jupyterhub?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"3.0.0+ds1-1",
"5.0.0+ds1-1",
"5.0.0+ds1-2",
"5.0.0+ds1-3",
"5.0.0+ds1-4",
"5.2.1+ds1-1",
"5.2.1+ds1-2",
"5.2.1+ds1-3",
"5.2.1+ds1-4",
"5.2.1+ds1-5"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-108752.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "jupyterhub",
"purl": "pkg:deb/debian/jupyterhub?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"5.2.1+ds1-4",
"5.2.1+ds1-5"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-108752.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "jupyterhub",
"purl": "pkg:deb/debian/jupyterhub?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"5.2.1+ds1-4",
"5.2.1+ds1-5"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-108752.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-23T17:47:38.817602064Z",
"provider": "osv",
"upstream": [
"CVE-2026-108752"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-108752"
]
},
"related_cves": [
{
"value": "CVE-2026-108752",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 418125,
"published_at": "2026-10-11T13:17:20.097+00:00"
}