CVE WatchJul 14, 2026

CVE-2026-49955

Hermes WebUI before version 0.51.270 contains a resource exhaustion vulnerability that allows unauthenticated remote attackers to degrade se

CVSS

5.3

Medium

EPSS

0.6%

p44

KEV

—

Exploit Today

0-100

Published: Jun 9, 2026 · Last modified: Jul 14, 2026 · CWE-770

EPSS · 30d

0.6%EPSS · 30 days0.6%

2026-06-302026-07-17

Technical 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.

Official references

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