CVE-2026-34052 — LTI JupyterHub Authenticator: Unbounded Memory Growth via Nonce Storage (Denial of Service)
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 with…
Published: 2026-04-03 · CVSS: 5.9 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7