Netty is a widely used Java networking framework; this flaw can bypass proxies/gateways and affect many enterprise services.
CVE-2026-93569
Netty HTTP/1→HTTP/2 authority mismatch allows bypass, cache poisoning, misrouting
Is CVE-2026-93569 being exploited?
Not confirmed. CVE-2026-93569 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.
How severe is CVE-2026-93569?
CVE-2026-93569 is rated High with a CVSS score of 8.2. 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-2026-93569?
Not known from our data. No patch reference has been recorded for CVE-2026-93569, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-93569 affect?
CVE-2026-93569 affects Netty (HTTP/2 conversion modules), Netty-based proxies/gateways, Applications using Netty HTTP stack. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-93569?
Apply vendor updates or mitigations; normalize Host/:authority handling and block conflicting requests
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote unauthenticated attackers can bypass proxy controls, cause cache poisoning, or misroute requests by exploiting Host vs request-target authority mismatch.
Immediate action required