CVE-2026-34052: CWE-401: Missing Release of Memory after Effective Lifetime in jupyterhub ltiauthenticator
CVE-2026-34052 is a medium severity vulnerability in the LTI JupyterHub Authenticator (ltiauthenticator) prior to version 1. 6. 3. The issue involves unbounded growth of a class-level dictionary storing OAuth nonces, which are added before signature validation. An attacker with knowledge of a valid consumer key can send repeated requests with unique nonces to exhaust server memory, resulting in a denial of service. This vulnerability has been patched in version 1. 6. 3.
AI Analysis
Technical Summary
The LTI JupyterHub Authenticator before version 1.6.3 contains a memory management flaw where OAuth nonces are stored in a class-level dictionary that grows without bounds. Since nonces are added before validating the request signature, an attacker who knows a valid consumer key can submit numerous requests with unique nonces, causing the dictionary to expand indefinitely and exhaust server memory. This leads to a denial of service condition. The vulnerability is identified as CWE-401 (Missing Release of Memory after Effective Lifetime) and CWE-770 (Allocation of Resources Without Limits or Throttling). The issue has been addressed in version 1.6.3 of the ltiauthenticator.
Potential Impact
Successful exploitation allows an unauthenticated attacker with knowledge of a valid consumer key to cause a denial of service by exhausting server memory through repeated requests with unique OAuth nonces. There is no impact on confidentiality or integrity reported.
Mitigation Recommendations
Upgrade the ltiauthenticator to version 1.6.3 or later, where this issue has been patched. No other mitigation or temporary workaround is indicated. Patch status is not explicitly confirmed in the vendor advisory, but the description states 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
CVE-2026-34052 is a medium severity vulnerability in the LTI JupyterHub Authenticator (ltiauthenticator) prior to version 1. 6. 3. The issue involves unbounded growth of a class-level dictionary storing OAuth nonces, which are added before signature validation. An attacker with knowledge of a valid consumer key can send repeated requests with unique nonces to exhaust server memory, resulting in a denial of service. This vulnerability has been patched in version 1. 6. 3.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The LTI JupyterHub Authenticator before version 1.6.3 contains a memory management flaw where OAuth nonces are stored in a class-level dictionary that grows without bounds. Since nonces are added before validating the request signature, an attacker who knows a valid consumer key can submit numerous requests with unique nonces, causing the dictionary to expand indefinitely and exhaust server memory. This leads to a denial of service condition. The vulnerability is identified as CWE-401 (Missing Release of Memory after Effective Lifetime) and CWE-770 (Allocation of Resources Without Limits or Throttling). The issue has been addressed in version 1.6.3 of the ltiauthenticator.
Potential Impact
Successful exploitation allows an unauthenticated attacker with knowledge of a valid consumer key to cause a denial of service by exhausting server memory through repeated requests with unique OAuth nonces. There is no impact on confidentiality or integrity reported.
Mitigation Recommendations
Upgrade the ltiauthenticator to version 1.6.3 or later, where this issue has been patched. No other mitigation or temporary workaround is indicated. Patch status is not explicitly confirmed in the vendor advisory, but the description states 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: 4/3/2026, 10:45:50 PM
Last updated: 4/3/2026, 11:33:24 PM
Views: 3
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