Is CVE-2026-55205 actively exploited?

No active exploitation of CVE-2026-55205 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-55205 be exploited remotely?

Yes. CVE-2026-55205 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-55205?

CVE-2026-55205 has a CVSS score of 5.3 (MEDIUM).

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MEDIUM

CVE-2026-55205

CWE-770Published: June 18, 2026· Updated: Jun 22, 2026

5.3

CVSS v3.1

Official Description

Hermes WebUI before 0.51.468 contains a resource exhaustion vulnerability in the unauthenticated POST /api/onboarding/oauth/start endpoint that allows unbounded accumulation of in-memory flow state and daemon threads. Attackers can send repeated or concurrent requests to exhaust server memory and thread resources, potentially triggering repeated outbound device-code requests to upstream OAuth providers.

NVD Source

Technical Analysis

CVE-2026-55205 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.