Is CVE-2026-55205 in the CISA KEV catalog?

No. CVE-2026-55205 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-55205?

CVE-2026-55205 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2026-55205?

CVE-2026-55205 has an EPSS score of 0.30% (22th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2026-55205?

No published fix for CVE-2026-55205 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2026-55205

MEDIUM

5.3

CVSS v3

NVD

Description

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.

CWE-770Allocation of Resources Without Limits or Throttling

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

0.30%probability of exploitation in 30 days

22ndpercentile

Low risk: more likely to be exploited than 22% of all known CVEs.

References

Other references5

Embed a live status badge for CVE-2026-55205

Markdown

[![CVE-2026-55205](https://tridentstack.com/cve/badge/CVE-2026-55205.svg)](https://tridentstack.com/cve/CVE-2026-55205)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-55205"><img src="https://tridentstack.com/cve/badge/CVE-2026-55205.svg" alt="CVE-2026-55205"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-22.