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Vulnerabilities CVE-2026-49955

CVE-2026-49955

Medium
Open
TLP:CLEAR

Hermes WebUI < 0.51.270 Resource Exhaustion via passkey/options

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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.

Details

CVSS Score
6.9
EPSS Score
0.59%

45th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Confidence
90%
Published
Jun 9, 2026
Last Modified
Jul 14, 2026
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