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Vulnerability record · CVE-2026-93569 · published 18 September 2026

CVE-2026-93569: HTTP request smuggling vulnerability

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.

8.2 CVSS 3.1 High EPSS 0.70% · top 48.8% CWE-444 · HTTP request smuggling Awaiting Analysis
8.2CVSS 3.1 base score
0.70%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
22 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:69440
https://access.redhat.com/errata/RHSA-2026:69470
https://access.redhat.com/errata/RHSA-2026:70257
https://access.redhat.com/security/cve/CVE-2026-93569
https://bugzilla.redhat.com/show_bug.cgi?id=2536962

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Source: NIST National Vulnerability Database (record CVE-2026-93569), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.