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VULNERABILITIES

CVE-2026-34052 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:5.9 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/jupyterhub/ltiauthenticator/releases/tag/1.6.3 [email protected]Product
https://github.com/jupyterhub/ltiauthenticator/security/advisories/GHSA-8mxq-7xr7-2fxj [email protected]Vendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-401Missing Release of Memory after Effective Lifetime[email protected]
CWE-770Allocation of Resources Without Limits or Throttling[email protected]

Affected Products

ProductVersions
jupyter lti jupyterhub authenticator
< 1.6.3

CPE

  • cpe:2.3:a:jupyter:lti_jupyterhub_authenticator:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

5 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-34052
NVD Published Date:
Apr 3, 2026
NVD Last Modified:
Jul 24, 2026
Source:
[email protected]
CVE-2026-34052 Details - Not Deferred