CVE-2026-49955
MEDIUMHermes WebUI < 0.51.270 Resource Exhaustion via passkey/options
Title source: cnaDescription
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.
References (5)
Core 5
Core References
Release Notes release-notes
https://github.com/nesquena/hermes-webui/releases/tag/v0.51.270
Technical Description technical-description
https://github.com/nesquena/hermes-webui/pull/3624
Issue Tracking issue-tracking
https://github.com/nesquena/hermes-webui/pull/3674
Patch patch
https://github.com/nesquena/hermes-webui/commit/58528a4d88b0fa4f7b822e31d6051c669769bd3b
Third Party Advisory third-party-advisory
https://www.vulncheck.com/advisories/hermes-webui-resource-exhaustion-via-passkey-options
Scores
CVSS v3
5.3
EPSS
0.0015
EPSS Percentile
35.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-770
Status
published
Products (1)
nesquena/hermes-webui
< 0.51.270
Published
Jun 09, 2026
Tracked Since
Jun 09, 2026