cbcvebase.
CVE-2026-4634
published 2026-04-02

CVE-2026-4634: A flaw was found in Keycloak. An unauthenticated attacker can exploit this vulnerability by sending a specially crafted POST request with an excessively long…

PriorityP347high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.52%
40.9th percentile
A flaw was found in Keycloak. An unauthenticated attacker can exploit this vulnerability by sending a specially crafted POST request with an excessively long scope parameter to the OpenID Connect (OIDC) token endpoint. This leads to high resource consumption and prolonged processing times, ultimately resulting in a Denial of Service (DoS) for the Keycloak server.

Affected

4 ranges
VendorProductVersion rangeFixed in
redhatbuild_of_keycloak
redhatbuild_of_keycloak
redhatbuild_of_keycloak
redhatbuild_of_keycloak

CVSS provenance

nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vendor_redhat7.5HIGH
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