Is CVE-2026-34052 actively exploited?

No active exploitation of CVE-2026-34052 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-34052 be exploited remotely?

Yes. CVE-2026-34052 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-34052?

CVE-2026-34052 has a CVSS score of 5.9 (MEDIUM).

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MEDIUM

CVE-2026-34052

CWE-401Published: April 3, 2026· Updated: Apr 7, 2026

5.9

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:12.0th

Official 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.

NVD Source

Technical Analysis

CVE-2026-34052 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.9.