CVE-2026-55205

As of 2026-06-18, CVE-2026-55205 is a CVSS 5.3 (MEDIUM-severity) vulnerability. Threadlinqs Intelligence tracks 0 threats exploiting it.

Last updated: 2026-06-18

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.

CVSS v3 vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Weaknesses (CWE)

CWE-770

References

• https://github.com/nesquena/hermes-webui/releases/tag/v0.51.468
• https://github.com/nesquena/hermes-webui/pull/3970
• https://github.com/nesquena/hermes-webui/pull/4338
• https://github.com/nesquena/hermes-webui/commit/ce272d9cd5f8e5a4521278f56eb5388010901646
• https://www.vulncheck.com/advisories/hermes-webui-resource-exhaustion-via-unauthenticated-oauth-flow-endpoint

← all vulnerabilities · Markdown version · Threadlinqs Intelligence

Enriched from CVE.org, NVD (this product uses the NVD API but is not endorsed or certified by the NVD), FIRST EPSS, CISA KEV, and GitHub Security Advisories.