CVE-2026-58172
IP allowlist bypass via WebSocket upgrade in Ocelot <= 24.1.0
Is CVE-2026-58172 being exploited?
Not confirmed. CVE-2026-58172 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.56% probability of exploitation in the next 30 days.
How severe is CVE-2026-58172?
CVE-2026-58172 is rated Critical with a CVSS score of 9.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-58172?
Yes. A fix has been recorded for CVE-2026-58172. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-58172 affect?
CVE-2026-58172 affects Ocelot API Gateway (C#/.NET) <= 24.1.0. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-58172?
Upgrade to patched release; verify SecurityMiddleware in WebSocket path.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Bypass of IP allowlist via WebSocket upgrade; blocked IPs proxied to downstream services, enabling access to protected resources and potential downstream RCE.
Patch when possible
- affected<= 24.1.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.