CVE-2026-34052

MEDIUM
2026-04-03 https://github.com/jupyterhub/ltiauthenticator GHSA-8mxq-7xr7-2fxj
5.9
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Patch Released
Apr 04, 2026 - 02:30 nvd
Patch available
Analysis Generated
Apr 03, 2026 - 22:15 vuln.today
CVE Published
Apr 03, 2026 - 21:42 nvd
MEDIUM 5.9

Tags

Denial Of Service

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

Analysis

Memory exhaustion denial of service in jupyterhub-litauthenticator 1.6.2 and earlier allows unauthenticated remote attackers to crash the LTI 1.1 validator by submitting repeated requests with unique OAuth nonces. The vulnerability exists because nonces are stored in an unbounded class-level dictionary before signature validation occurs, enabling an attacker with knowledge of a valid consumer key to gradually exhaust server memory without authentication. …

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Priority Score

30
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +30
POC: 0

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CVE-2026-34052 vulnerability details – vuln.today
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