CVE-2026-58172

criticalCVSS 9.1covered by 1 sourcefirst seen 2026-06-30

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.

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Exploitation outlook

Low exploitation risk0.41% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all EPSS-scored CVEs.

Advisory coverage (1)

criticalCVE-2026-58172: Ocelot through 24.1.0, fixed in commit f156fd4, contains a security control bypass vulnerabili…nvd · 2026-06-30

External references

NVD record for CVE-2026-58172

CVE.org record

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