CVE-2026-34052 MEDIUM

CVE-2026-34052: LTI JupyterHub Authenticator: Unbounded Memory Growth via Nonce Storage (Denial of Service)

Vendor Jupyterhub
Product ltiauthenticator
Weakness CWE-401
Published April 3, 2026
Last update April 6, 2026
View on NVD All CVEs

CVSS base score

5.9/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 3, 2026 CVE published
April 6, 2026 Record updated