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      <title>CVE-2026-34052 — LTI JupyterHub Authenticator: Unbounded Memory Growth via Nonce Storage (Denial of Service)</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-34052</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; jupyterhub ltiauthenticator&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; jupyterhub ltiauthenticator&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;</content:encoded>
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