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CVE-2026-55205

MEDIUM Exploitation: PoC
5.3
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-55205
State
PUBLISHED
Assigner
VulnCheck
Reserved
2026-06-16 15:53 UTC
Published
2026-06-18 15:49 UTC
Last updated
2026-06-18 17:36 UTC
Primary CWE
CWE-770
Allocation of Resources Without Limits or Throttling
Vendor / Product
nesquena / hermes-webui
Sources
cve.org  ·  NVD

Severity & Metrics

5.3 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
SSVC — CISA Coordinator
Exploitation
PoC
Automatable
yes
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
nesquena hermes-webui — 0 < 0.51.468, 0.51.468
Weakness (CWE)
CWESourceDescription
CWE-770 cna Allocation of Resources Without Limits or Throttling
CVSS scores (2)
ScoreSeverityVersionSourceVector
6.9 MEDIUM 4.0 cna CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
5.3 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
References (5)
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