CVE-2026-49955 MEDIUM

CVE-2026-49955: Hermes WebUI < 0.51.270 Resource Exhaustion via passkey/options

Vendor Nesquena
Product hermes-webui
Weakness CWE-770 · Uncontrolled resource consumption
Published June 9, 2026
Last update June 9, 2026
View on NVD All CVEs

CVSS base score

6.9/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 9, 2026 CVE published
June 9, 2026 Record updated