CVE-2026-58172
CRITICALOcelot - IP Allow/Block List Bypass for WebSocket Upgrade Requests
Title source: cnaDescription
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.
References (4)
Core 4
Core References
Exploit technical-description
exploit
Researcher Disclosure
https://github.com/ThreeMammals/Ocelot/issues/2403
Patch patch
Fix Commit
https://github.com/ThreeMammals/Ocelot/commit/f156fd4017ca25025fffdad8ec56c1d657dfb402
Third Party Advisory third-party-advisory
https://www.vulncheck.com/advisories/ocelot-ip-allow-block-list-bypass-for-websocket-upgrade-requests
Scores
CVSS v3
9.1
EPSS
0.0041
EPSS Percentile
33.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-288
Status
published
Products (2)
ThreeMammals/Ocelot
< 24.1.0
ThreeMammals/Ocelot
f156fd4017ca25025fffdad8ec56c1d657dfb402
Published
Jun 30, 2026
Tracked Since
Jun 30, 2026