CVE-2026-58172

Ocelot - IP Allow/Block List Bypass for WebSocket Upgrade Requests

CVSS 9.3 CRITICALCWE-288

Vexday Risk Score

25Bajo

Decisión SSVC (CISA)

Track

Sin señal de explotación → monitorear

CVSS 9.3EPSS —KEV nãoPoC —Nuclei —Metasploit —Patch referenciado

Ciclo de vida

30 jun 2026Publicada en NVD

Recomendación: Monitorear — sin señal de explotación por ahora.

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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Productos afectados

ThreeMammals · Ocelot

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Referencias

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