--- title: "CVE-2026-93569: CVE-2026-93569" description: "A flaw was found in Netty. A remote unauthenticated attacker can exploit a vulnerability in Netty's HTTP/1 to HTTP/2 conversion process. When an HTTP/1 request includes both an absolute-form request-target and a conflicting Host header, Netty incorrectly prioritizes the Host header for the HTTP/2 :authority field, discarding the original request-target authority. This inconsistency can allow an attacker to bypass security controls in Netty-based proxies or gateways, potentially leading to unauthorized access, cache poisoning, or misrouting of requests." url: https://panop.io/threat-heartbeat/CVE-2026-93569/ --- # CVE-2026-93569 CVE-2026-93569 A flaw was found in Netty. A remote unauthenticated attacker can exploit a vulnerability in Netty's HTTP/1 to HTTP/2 conversion process. When an HTTP/1 request includes both an absolute-form request-target and a conflicting Host header, Netty incorrectly prioritizes the Host header for the HTTP/2 :authority field, discarding the original request-target authority. This inconsistency can allow an attacker to bypass security controls in Netty-based proxies or gateways, potentially leading to unauthorized access, cache poisoning, or misrouting of requests. CVSS base score 8.2 /10 High CISA KEV Not listed Public exploit None known EPSS 2.07% chance of exploitation in 30 days [View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-93569) ## Details CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N Published 18 September 2026 Updated 15 October 2026 Weakness [CWE-444](https://cwe.mitre.org/data/definitions/444.html) ## References - [https://nvd.nist.gov/vuln/detail/CVE-2026-93569](https://nvd.nist.gov/vuln/detail/CVE-2026-93569) - [https://access.redhat.com/security/cve/CVE-2026-93569](https://access.redhat.com/security/cve/CVE-2026-93569) - [https://bugzilla.redhat.com/show\_bug.cgi?id=2536962](https://bugzilla.redhat.com/show_bug.cgi?id=2536962) - [https://access.redhat.com/errata/RHSA-2026:69470](https://access.redhat.com/errata/RHSA-2026:69470) - [https://access.redhat.com/errata/RHSA-2026:69440](https://access.redhat.com/errata/RHSA-2026:69440) - [https://access.redhat.com/errata/RHSA-2026:70257](https://access.redhat.com/errata/RHSA-2026:70257) [← All CVEs](https://panop.io/threat-heartbeat/) ## What this record can't tell you - Whether you run the affected software, and where - Whether an attacker can actually reach and exploit it - The misconfigurations that never get a CVE number - What it would cost the business, ranked into what to fix first Panop answers these inside your environment, for this CVE and every other finding. [Book a demo](https://panop.io/demo)