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CVE-2026-34052

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

Published: Apr 3, 2026Updated: Apr 13, 2026 Sources: CVE List NVDCWE-401
NVD MITRE
5.9CVSSMEDIUM
EPSS Score
0.3%
Top 75.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-401CWE-770

Affected Products

ltiauthenticatorjupyterhub
On-prem
AI / ML / notebook-mlops
lti jupyterhub authenticatorjupyter
Mixed
AI / ML / notebook-mlops
jupyterhuboss-projectAI / MLaka oauthenticator, jupyter-server-proxy
jupyteross-projectAI / MLaka notebook, jupyter server, jupyterlab

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

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

Timeline

Published
Apr 3, 2026
Last Updated
Apr 13, 2026

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