Feed/CVE-2026-9803
CVE-2026-9803MEDIUMCVSS 5.3

Keycloak has an Out-of-bounds Read

Published May 28, 2026·Updated Jul 1, 2026

NVD Description

A flaw was found in Keycloak's ClientRegistrationAuth component. A remote unauthenticated attacker can exploit this vulnerability by sending a specially crafted POST request with a malformed 'Authorization: Bearer' header to any client registration endpoint. This can lead to an ArrayIndexOutOfBoundsException, causing the server to return an HTTP 500 error and resulting in a Denial of Service (DoS) for the affected service.

Affected Packages (1)

org.keycloak:keycloak-servicesMAVEN
Fixed in = 26.4.7

CVSS Vector

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

References

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