CVE-2026-58172

Ocelot through 24.1.0, fixed in commit f156fd4, contains a security control bypass vulnerability that allows denied clients to circumvent IP-based access restrictions by sending WebSocket upgrade requests. The WebSocket upgrade pipeline branch configured via MapWhen in OcelotPipelineExtensions.cs omits SecurityMiddleware, causing requests from blocked IP addresses to be proxied to downstream services without enforcement of the configured allow/block list.

CVSS v3 9.1 CRITICAL

9.1^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/ThreeMammals/Ocelot/commit/f156fd4017ca25025fffdad8ec56c1d657dfb402
https://github.com/ThreeMammals/Ocelot/issues/2403
https://github.com/ThreeMammals/Ocelot/pull/2406
https://www.vulncheck.com/advisories/ocelot-ip-allow-block-list-bypass-for-websocket-upgrade-requests

Configurations

No configuration.

History

25 Oct 2026, 21:10

Type	Values Removed	Values Added
Summary		(es) Ocelot hasta la versión 24.1.0, corregido en el commit f156fd4, contiene una vulnerabilidad de omisión de control de seguridad que permite a clientes denegados eludir las restricciones de acceso basadas en IP enviando solicitudes de actualización de WebSocket. La rama de la tubería de actualización de WebSocket configurada a través de MapWhen en OcelotPipelineExtensions.cs omite SecurityMiddleware, lo que provoca que las solicitudes de direcciones IP bloqueadas sean redirigidas a servicios posteriores sin la aplicación de la lista de permitidos/bloqueados configurada.

Information

Published : 2026-06-30 17:16

Updated : 2026-10-25 21:10

NVD link : CVE-2026-58172

Mitre link : CVE-2026-58172

CVE.ORG link : CVE-2026-58172

JSON object : View

Products Affected

No product.

CWE

CWE-288

Authentication Bypass Using an Alternate Path or Channel

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