CVE-2026-34052: CWE-401: Missing Release of Memory after Effective Lifetime in jupyterhub ltiauthenticator
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.
AI Analysis
Technical Summary
CVE-2026-34052 is a medium severity vulnerability in the ltiauthenticator component of JupyterHub. Before version 1.6.3, the LTI 1.1 validator improperly manages OAuth nonces by storing them in a class-level dictionary that is never cleared, causing unbounded memory growth. An attacker who knows a valid consumer key can exploit this by sending many requests with unique nonces, leading to memory exhaustion and denial of service. The vulnerability is classified under CWE-401 (Missing Release of Memory) and CWE-770 (Allocation of Resources Without Limits or Throttling). The issue has been fixed in version 1.6.3.
Potential Impact
The vulnerability allows an unauthenticated attacker (no privileges required) with knowledge of a valid consumer key to cause a denial of service by exhausting server memory. There is no impact on confidentiality or integrity reported. The CVSS v3.1 score is 5.9 (medium), reflecting network attack vector, high attack complexity, no privileges required, no user interaction, and impact limited to availability.
Mitigation Recommendations
Upgrade the ltiauthenticator component of JupyterHub to version 1.6.3 or later, where this memory exhaustion issue has been patched. No other mitigations are indicated. Patch status is confirmed by the vendor advisory stating the issue is fixed in version 1.6.3.
CVE-2026-34052: CWE-401: Missing Release of Memory after Effective Lifetime in jupyterhub ltiauthenticator
Description
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-34052 is a medium severity vulnerability in the ltiauthenticator component of JupyterHub. Before version 1.6.3, the LTI 1.1 validator improperly manages OAuth nonces by storing them in a class-level dictionary that is never cleared, causing unbounded memory growth. An attacker who knows a valid consumer key can exploit this by sending many requests with unique nonces, leading to memory exhaustion and denial of service. The vulnerability is classified under CWE-401 (Missing Release of Memory) and CWE-770 (Allocation of Resources Without Limits or Throttling). The issue has been fixed in version 1.6.3.
Potential Impact
The vulnerability allows an unauthenticated attacker (no privileges required) with knowledge of a valid consumer key to cause a denial of service by exhausting server memory. There is no impact on confidentiality or integrity reported. The CVSS v3.1 score is 5.9 (medium), reflecting network attack vector, high attack complexity, no privileges required, no user interaction, and impact limited to availability.
Mitigation Recommendations
Upgrade the ltiauthenticator component of JupyterHub to version 1.6.3 or later, where this memory exhaustion issue has been patched. No other mitigations are indicated. Patch status is confirmed by the vendor advisory stating the issue is fixed in version 1.6.3.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-03-25T15:29:04.746Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69d03f860a160ebd92619e17
Added to database: 4/3/2026, 10:30:30 PM
Last enriched: 4/11/2026, 9:21:00 AM
Last updated: 5/20/2026, 9:40:53 PM
Views: 71
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