CVE catalog

CVE-2026-108752

JupyterHub through 6.0.1 contains an identifier…

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.

Severity: Low · CVSS 2.3CVSS: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
Published: Oct 11, 2026, 12:19:51 PM UTC
Updated: Oct 11, 2026, 1:17:20 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.24% · Oct 27, 2026

Projects and upstream resources

[python-qtconsole][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Distribution / release	Package	Version	Status	Source
BitnamiRelease not reported	jupyterhub	`6.1.0`	Fixed	[BIT-JUPYTERHUB-2026-108752]Oct 16, 2026, 9:45:25 AM UTC

Showing 1 fix observations. All 9 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
BitnamiRelease not reported	jupyterhub	`6.1.0`	Fixed	[BIT-JUPYTERHUB-2026-108752]Oct 16, 2026, 9:45:25 AM UTC
Debianbookworm	jupyterhub	Not reported	AffectedDistribution reports no fix	[CVE-2026-108752]
Debianbookworm	jupyterhub	`3.0.0+ds1-1`	Affected	[CVE-2026-108752]
Debianforky	jupyterhub	Not reported	AffectedDistribution reports no fix	[CVE-2026-108752]
Debianforky	jupyterhub	`5.2.1+ds1-5`	Affected	[CVE-2026-108752]
Debiansid	jupyterhub	Not reported	AffectedDistribution reports no fix	[CVE-2026-108752]
Debiansid	jupyterhub	`5.2.1+ds1-5`	Affected	[CVE-2026-108752]
Debiantrixie	jupyterhub	Not reported	AffectedDistribution reports no fix	[CVE-2026-108752]
Debiantrixie	jupyterhub	`5.2.1+ds1-4`	Affected	[CVE-2026-108752]

Original provider fields

{
  "package_releases": [
    {
      "name": "jupyterhub",
      "status": "vulnerable",
      "release": "sid",
      "version": "5.2.1+ds1-5"
    },
    {
      "name": "jupyterhub",
      "status": "vulnerable",
      "release": "forky",
      "version": "5.2.1+ds1-5"
    },
    {
      "name": "jupyterhub",
      "status": "vulnerable",
      "release": "trixie",
      "version": "5.2.1+ds1-4"
    },
    {
      "name": "jupyterhub",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "3.0.0+ds1-1"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "jupyterhub",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": null,
      "name": "jupyterhub",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": null,
      "name": "jupyterhub",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": null,
      "name": "jupyterhub",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "jupyterhub",
      "ranges": [
        {
          "type": "SEMVER",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.0"
            }
          ]
        }
      ],
      "versions": [],
      "ecosystem": "Bitnami",
      "provider_url": "https://osv.dev/vulnerability/BIT-jupyterhub-2026-108752",
      "fixed_version": "6.1.0",
      "provider_source": "pypi",
      "provider_record_id": "BIT-JUPYTERHUB-2026-108752",
      "provider_updated_at": "2026-10-16T09:45:25.604844190Z"
    }
  ]
}

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[jupyterhub]Affected
Details (2)
- 3.0.0+ds1-1 · all · bookworm
  Affected
  nvd · jupyterhub · debian · bookworm; pypi · jupyterhub · debian · 12
- 3.0.0+ds1-1 · all · bookworm
  Affected
  nvd · jupyterhub · debian · bookworm; pypi · jupyterhub · debian · 12

[Debian 13 (Trixie)]

[jupyterhub]Affected
Details (2)
- 5.2.1+ds1-4 · all · trixie
  Affected
  nvd · jupyterhub · debian · bookworm; pypi · jupyterhub · debian · 13
- 5.2.1+ds1-4 · all · trixie
  Affected
  nvd · jupyterhub · debian · bookworm; pypi · jupyterhub · debian · 13

Observed: Oct 29, 2026, 8:36:22 AM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database]