CVE-2026-58172Public exploitNetwork attack vector

IP restriction bypass via WebSocket pipeline fork

Published Jun 30, 2026 · Updated Jun 30, 2026

Authentication bypass in ThreeMammals Ocelot 24.1.0 and earlier allows remote attackers to access IP-restricted WebSocket services. The MapWhen WebSocket branch in OcelotPipelineExtensions.cs proxies upgrades without invoking SecurityMiddleware, so configured IP allow and block lists never run. Exploitation requires a WebSocket-capable route protected by SecurityOptions and exposes the downstream channel's permitted reads and writes.

CVSS severity9.3
Critical
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in ThreeMammals Ocelot 24.1.0 and earlier allows remote attackers to access IP-restricted WebSocket services. The MapWhen WebSocket branch in OcelotPipelineExtensions.cs proxies upgrades without invoking SecurityMiddleware, so configured IP allow and block lists never run. Exploitation requires a WebSocket-capable route protected by SecurityOptions and exposes the downstream channel's permitted reads and writes.

The record

CVE
CVE-2026-58172
Published
Jun 30, 2026
Updated
Jun 30, 2026
Vendor
ThreeMammals
Product
Ocelot
Classifications
CWE-288, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=24.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ThreeMammals · Ocelotversion=0 <=24.1.0

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
9.1VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-288Authentication Bypass Using an Alternate Path or Channel
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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