PT-2026-50709 · Nesquena · Hermes-Webui

Published 2026-06-18 · Updated 2026-06-18 · CVE-2026-55205

NVD

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Hermes WebUI before 0.51.468 contains a resource exhaustion vulnerability in the unauthenticated POST /api/onboarding/oauth/start endpoint that allows unbounded accumulation of in-memory flow state and daemon threads. Attackers can send repeated or concurrent requests to exhaust server memory and thread resources, potentially triggering repeated outbound device-code requests to upstream OAuth providers.

Exploit

Fix

Allocation of Resources Without Limits

Weakness Enumeration

CWE-770

Related Identifiers

CVE-2026-55205

Affected Products

Hermes-Webui

References · 6

• 🔥 https://github.com/nesquena/hermes-webui/pull/3970 · Exploit
• https://github.com/nesquena/hermes-webui/commit/ce272d9cd5f8e5a4521278f56eb5388010901646 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-55205 · Security Note
• https://github.com/nesquena/hermes-webui/pull/4338 · Note
• https://github.com/nesquena/hermes-webui/releases/tag/v0.51.468 · Note
• https://vulncheck.com/advisories/hermes-webui-resource-exhaustion-via-unauthenticated-oauth-flow-endpoint · Note