CVE-2026-34052
LTI JupyterHub Authenticator: Unbounded Memory Growth via Nonce Storage (Denial of Service)
5.9
MEDIUM
CVSS 3.1
EPSS 0.02%
Description
## 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 to fix CVE-2026-34052
To remediate CVE-2026-34052, upgrade the affected package to a fixed version below.
- —upgrade to 1.6.3 or later
Is CVE-2026-34052 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 1.6.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |