CVE-2026-34052

CVE-2026-34052 affects the LTI JupyterHub Authenticator used with JupyterHub. Prior to version 1.6.3, the LTI 1.1 validator stores OAuth nonces in a class-level dictionary that grows without bounds, with nonces added before signature validation. An attacker who knows a valid consumer key can send...

GHSA-MCGX-2GCR-P3HP LTI JupyterHub Authenticator does not properly validate JWT Signature

Impact Only users that has configured a JupyterHub installation to use the authenticator class LTI13Authenticator are influenced. LTI13Authenticator that was introduced in jupyterhub-ltiauthenticator 1.3.0 wasn't validating JWT signatures. This is believed to allow the LTI13Authenticator to...