CVE-2026-34052

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

State: Published
Severity: 5.9 Medium
Published: Apr 3, 2026
Updated: Apr 6, 2026
Reserved: Mar 25, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.9 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-401 Missing Release of Memory after Effective Lifetime
CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
ltiauthenticatorjupyterhub	< 1.6.3Affected

References

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