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CVE Vulnerability Details :
CVE-2026-34052
PUBLISHED
More InfoOfficial Page
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
View Known Exploited Vulnerability (KEV) details
Published At-03 Apr, 2026 | 22:04
Updated At-06 Apr, 2026 | 18:59
Rejected At-
▼CVE Numbering Authority (CNA)
LTI JupyterHub Authenticator: Unbounded Memory Growth via Nonce Storage (Denial of Service)

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.

Affected Products
Vendor
jupyterhub
Product
ltiauthenticator
Versions
Affected
  • < 1.6.3
Problem Types
TypeCWE IDDescription
CWECWE-401CWE-401: Missing Release of Memory after Effective Lifetime
CWECWE-770CWE-770: Allocation of Resources Without Limits or Throttling
Type: CWE
CWE ID: CWE-401
Description: CWE-401: Missing Release of Memory after Effective Lifetime
Type: CWE
CWE ID: CWE-770
Description: CWE-770: Allocation of Resources Without Limits or Throttling
Metrics
VersionBase scoreBase severityVector
3.15.9MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Version: 3.1
Base score: 5.9
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/jupyterhub/ltiauthenticator/security/advisories/GHSA-8mxq-7xr7-2fxj
x_refsource_CONFIRM
https://github.com/jupyterhub/ltiauthenticator/releases/tag/1.6.3
x_refsource_MISC
Hyperlink: https://github.com/jupyterhub/ltiauthenticator/security/advisories/GHSA-8mxq-7xr7-2fxj
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/jupyterhub/ltiauthenticator/releases/tag/1.6.3
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found