CVE-2026-58172 PUBLISHED

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

Assigner: VulnCheck
Reserved: 29.06.2026 Published: 30.06.2026 Updated: 01.07.2026

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 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS Score: 9.1

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	None

CVSS 3.1

CVSS Vector: 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
CVSS Score: 9.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	ThreeMammals
Product	Ocelot
Versions	Default: unaffected affected from 0 to 24.1.0 (incl.) Version f156fd4017ca25025fffdad8ec56c1d657dfb402 is unaffected

CVE-2026-58172 PUBLISHED

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

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Problem Types