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CVE-2026-34052— LTI JupyterHub Authenticator: Unbounded Memory Growth via Nonce Storage (Denial of Service)

Quick assessment

Affected
jupyterhub ltiauthenticator
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LTI JupyterHub Authenticator是JupyterHub开源的一个 LTI 的 JupyterHub 认证器。 LTI JupyterHub Authenticator 1.6.3之前版本存在安全漏洞，该漏洞源于OAuth随机数存储无限制增长，可能导致拒绝服务攻击。

CVSS 5.9 · Medium EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service
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I. Basic Information for CVE-2026-34052

Vulnerability Information
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Vulnerability Title
LTI JupyterHub Authenticator: Unbounded Memory Growth via Nonce Storage (Denial of Service)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在移除最后引用时对内存的释放不恰当(内存泄露)
Source: CVE Program / CVE List V5
Vulnerability Title
LTI JupyterHub Authenticator 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LTI JupyterHub Authenticator是JupyterHub开源的一个 LTI 的 JupyterHub 认证器。 LTI JupyterHub Authenticator 1.6.3之前版本存在安全漏洞，该漏洞源于OAuth随机数存储无限制增长，可能导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
jupyterhub ltiauthenticator < 1.6.3 -

II. Public POCs for CVE-2026-34052

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III. Intelligence Information for CVE-2026-34052

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Same Patch Batch · jupyterhub · 2026-04-03 · 3 CVEs total

CVE-2026-33175 8.8 HIGH OAuthenticator: Authentication Bypass in Auth0OAuthenticator via Unverified Email Claims
CVE-2026-33709 JupyterHub has an Open Redirect Vulnerability

IV. Related Vulnerabilities

Same product: ltiauthenticator
Same vendor: jupyterhub
Same weakness: CWE-401

V. Comments for CVE-2026-34052

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