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 3.1

8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

EPSS

2.2% chance of exploitation in the next 30 days; higher than 82% of CVEs (scores of 2026-10-25)

CWE

CWE-444

Published

2026-09-18

Modified

2026-10-19

Record from

the NVD, synced 2026-10-19

References

• 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/errata/RHSA-2026:83612
• https://access.redhat.com/security/cve/CVE-2026-93569

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