CVE-2026-34052
MEDIUMLTI JupyterHub Authenticator: Unbounded Memory Growth via Nonce Storage (Denial of Service)
Title source: cnaDescription
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)
Core 2
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/jupyterhub/ltiauthenticator/security/advisories/GHSA-8mxq-7xr7-2fxj
X_Refsource_Misc x_refsource_misc
https://github.com/jupyterhub/ltiauthenticator/releases/tag/1.6.3
Scores
CVSS v3
5.9
EPSS
0.0033
EPSS Percentile
24.4%
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