CVE-2026-34052
Medium
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.
SeverityMedium
CVSS5.9
Exploit probability—
ProductLti Jupyterhub Authenticator
PublishedApr 3, 2026
First seenApr 3, 2026
How to fix
Update
- jupyter lti_jupyterhub_authenticator1.6.3 or later
- jupyterhub-ltiauthenticator1.6.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| jupyter lti_jupyterhub_authenticator | v < 1.6.3 | 1.6.3 |
| jupyterhub-ltiauthenticatorPyPI | v < 1.6.3 | 1.6.3 |
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