🛡️ CVE-2026-34052 — jupyterhub-ltiauthenticator

🟡 CVSS 5.9 — Medium ✅ No Known Exploit CWE-401 NVD
5.9
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

Summary

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.

Patches

  • upgrade jupyterhub-litauthenticator to 1.6.3

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

CVE-2026-34052 is classified as CWE-401: Memory Leak. Allocated memory is never released, so long-running or repeated operations gradually exhaust it.

Affected software

CVE-2026-34052 is recorded against 2 packages.

  • jupyterhub-ltiauthenticator (fixed in 1.6.3)
  • lti-jupyterhub-authenticator (fixed in 1.6.3)

Timeline and source

Published on 3 April 2026 and last revised on 13 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Package)
github.com (Web)

Details

Severity Medium
CVSS Score 5.9
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-401
Public Exploit ✅ No
Source NVD
Published 2026-04-03
Updated 2026-08-12
Modified 2026-07-13
Fix URL N/A

Affected Packages

Software From version Fixed in
jupyterhub-ltiauthenticator 1.6.3
lti-jupyterhub-authenticator 1.6.3

Similar Threats

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