LTI JupyterHub Authenticator: Unbounded Memory Growth via Nonce Storage (Denial of Service)

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Summary

CVECVE-2026-34052
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-03 23:17:03 UTC
Updated2026-04-13 17:44:00 UTC
DescriptionLTI 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.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000550000 probability, percentile 0.172760000 (date 2026-04-15)

Problem Types: CWE-401 | CWE-770 | CWE-401 CWE-401: Missing Release of Memory after Effective Lifetime | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Jupyter Lti Jupyterhub Authenticator All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Jupyterhub Ltiauthenticator affected < 1.6.3 Not specified

References

ReferenceSourceLinkTags
github.com/jupyterhub/ltiauthenticator/releases/tag/1.6.3 [email protected] github.com Product
github.com/jupyterhub/ltiauthenticator/security/advisories/GHSA-8mxq-7xr... [email protected] github.com Vendor Advisory
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