Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/nesquena/hermes-webui/commit/58528a4d88b0fa4f7b822e31d6051c66
- https://github.com/nesquena/hermes-webui/pull/3624
- https://github.com/nesquena/hermes-webui/pull/3674
- https://github.com/nesquena/hermes-webui/releases/tag/v0.51.270
- https://www.vulncheck.com/advisories/hermes-webui-resource-exhaustion-via-passke
FAQ
What is CVE-2026-49955?
CVE-2026-49955 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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...
How severe is CVE-2026-49955?
CVE-2026-49955 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-49955?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.