Is CVE-2026-49955 actively exploited?

No active exploitation of CVE-2026-49955 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-49955 be exploited remotely?

Yes. CVE-2026-49955 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-49955?

CVE-2026-49955 has a CVSS score of 5.3 (MEDIUM).

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MEDIUM

CVE-2026-49955

CWE-770Published: June 9, 2026· Updated: Jun 9, 2026

5.3

CVSS v3.1

EPSS:0.15%probability of exploitation in 30 daysPercentile:35.0th

Official Description

Hermes WebUI before version 0.51.270 contains a resource exhaustion vulnerability that allows unauthenticated remote attackers to degrade service availability by repeatedly calling the passkey options endpoint without completing assertion. Attackers can send unlimited POST requests to the authentication endpoint, causing unbounded growth of the challenge store file and excessive CPU and disk I/O through repeated JSON file rewrites.

NVD Source

Technical Analysis

CVE-2026-49955 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.