---
cve: "CVE-2026-34052"
severity: "MEDIUM"
cvss: 5.9
epss: "33%"
vendor: "jupyterhub"
kev: false
exploited: false
published: "2026-04-03 23:17:03"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-19T23:11:33+02:00"
---

# CVE-2026-34052

> 5.9 MEDIUM · 🧪 PoC

## Beschreibung

LTI JupyterHub Authenticator is a JupyterHub authenticator for LTI. Prior to version 1.6.3, the LTI 1.1 validator stores OAuth nonces in a class-level dictionary that grows without bounds. Nonces are added before signature validation, so an attacker with knowledge of a valid consumer key can send repeated requests with unique nonces to gradually exhaust server memory, causing a denial of service. This issue has been patched in version 1.6.3.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- 4fb95e2b72ec87c2000c5b6ea1968479c1a82382 (Commit)

## Referenzen

- <https://github.com/jupyterhub/ltiauthenticator/security/advisories/GHSA-8mxq-7xr7-2fxj>
- <https://github.com/jupyterhub/ltiauthenticator/releases/tag/1.6.3>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-34052) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_