CVE-2026-49955 — Hermes WebUI < 0.51.270 Resource Exhaustion via passkey/options
Hermes WebUI before version 0.51.270 contains a resource exhaustion vulnerability that allows unauthenticated remote attackers to degrade service availability by repeatedly call…
Published: 2026-06-09 · CVSS: 6.9 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7