CVE-2026-34052CWE-401CWE-770

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

Medium · published April 3, 2026

CVSS v3.1
5.9
EPSS
0%
Percentile
34.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00412 · 34.4th percentile
Weaknesses
CWE-401 · Missing Release of Memory after Effective Lifetime; CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2026-04-03T22:04Z
EPSS history
Timeline
  • 03 APR 22:04Z
    LTI JupyterHub Authenticator: Unbounded Memory Growth via Nonce Storage (Denial of Service)
    cvelistv5