medium5.9
CVE-2026-34052
LTI JupyterHub Authenticator: Unbounded Memory Growth via Nonce Storage (Denial of Service)
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | jupyterhub-ltiauthenticator | <= 1.6.2 | 1.6.3 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Jupyter | Lti Jupyterhub Authenticator | before 1.6.3 |