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CVE-2026-58172— Ocelot - IP Allow/Block List Bypass for WebSocket Upgrade Requests

Quick assessment

Affected
ThreeMammals Ocelot
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Three Mammals Ocelot是Three Mammals组织的一款用于实现API网关、请求路由、身份认证与服务聚合的.NET网关框架。 Three Mammals Ocelot 24.1.0及之前版本存在授权问题漏洞，该漏洞源于WebSocket升级管道分支忽略了SecurityMiddleware，导致已拒绝的客户端通过发送WebSocket升级请求绕过基于IP的访问限制，将请求代理到下游服务而未执行配置的允许/阻止列表。

CVSS 9.1 · Critical EPSS 0.56% · P45

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
ThreeMammals Ocelot ≤ 24.1.0 affected
f156fd4017ca25025fffdad8ec56c1d657dfb402 unaffected
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I. Basic Information for CVE-2026-58172

Vulnerability Information
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Vulnerability Title
Ocelot - IP Allow/Block List Bypass for WebSocket Upgrade Requests
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用候选路径或通道进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Three Mammals Ocelot 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Three Mammals Ocelot是Three Mammals组织的一款用于实现API网关、请求路由、身份认证与服务聚合的.NET网关框架。 Three Mammals Ocelot 24.1.0及之前版本存在授权问题漏洞，该漏洞源于WebSocket升级管道分支忽略了SecurityMiddleware，导致已拒绝的客户端通过发送WebSocket升级请求绕过基于IP的访问限制，将请求代理到下游服务而未执行配置的允许/阻止列表。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ThreeMammals Ocelot 0 ~ 24.1.0 -

II. Public POCs for CVE-2026-58172

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8989 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-58172

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Patches & Fixes for CVE-2026-58172 (1)

Vendor Advisories for CVE-2026-58172 (1)

Exploits & Public PoCs for CVE-2026-58172 (1)

IV. Related Vulnerabilities

Same weakness: CWE-288

V. Comments for CVE-2026-58172

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