GitHub Advisoryadvisory · PyPI

GHSA-8mxq-7xr7-2fxj LTI JupyterHub Authenticator: Unbounded Memory Growth via Nonce Storage (Denial of Service)

MEDIUM Published 2026-04-03 Modified 2026-04-06 Official page ↗
Aliases
CVE-2026-34052
Ecosystem
PyPI
Packages
jupyterhub-ltiauthenticator
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-401, CWE-770
Reviewed
2026-04-03

Affected packages

• PyPI jupyterhub-ltiauthenticator: < 1.6.3 → fixed in 1.6.3

Description

Summary 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. Patches • upgrade jupyterhub-litauthenticator to 1.6.3

Related

Alias · CVE (1)

  • CVE-2026-34052 LTI JupyterHub Authenticator is a JupyterHub authenticator for LTI. vulnerability

Weakness · CWE (2)

  • CWE-401 Missing Release of Memory after Effective Lifetime weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling weakness

References