CVE-2026-34052

MEDIUM

LTI JupyterHub Authenticator: Unbounded Memory Growth via Nonce Storage (Denial of Service)

Title source: cna
STIX 2.1

Description

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.

References (2)

Scores

CVSS v3 5.9
EPSS 0.0006
EPSS Percentile 17.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-401 CWE-770
Status published
Products (3)
jupyter/lti_jupyterhub_authenticator < 1.6.3
jupyterhub/ltiauthenticator < 1.6.3
pypi/jupyterhub-ltiauthenticator 0 - 1.6.3PyPI
Published Apr 03, 2026
Tracked Since Apr 04, 2026