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CVE Vulnerabilities

CVE-2026-4634

Excessive Platform Resource Consumption within a Loop

Published: Apr 02, 2026 | Modified: Oct 26, 2026
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
RedHat/V2
RedHat/V3
7.5 IMPORTANT
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Ubuntu
Vulnerability-free packages from our partners
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-4634
CWEhttps://cwe.mitre.org/data/definitions/1050.html

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.

Weakness

The product has a loop body or loop condition that contains a control element that directly or indirectly consumes platform resources, e.g. messaging, sessions, locks, or file descriptors.

Affected Software

NameVendorStart VersionEnd Version
Build_of_keycloakRedhat- (including)- (including)
Build_of_keycloakRedhat26.2 (including)26.2 (including)
Build_of_keycloakRedhat26.2.15 (including)26.2.15 (including)
Build_of_keycloakRedhat26.4 (including)26.4 (including)
Build_of_keycloakRedhat26.4.11 (including)26.4.11 (including)
Red Hat build of Keycloak 26.2RedHatrhbk/keycloak-operator-bundle:26.2.15-1*
Red Hat build of Keycloak 26.2RedHatrhbk/keycloak-rhel9:26.2-18*
Red Hat build of Keycloak 26.2RedHatrhbk/keycloak-rhel9-operator:26.2-18*
Red Hat build of Keycloak 26.2.15RedHatrhbk/keycloak-rhel9*
Red Hat build of Keycloak 26.4RedHatrhbk/keycloak-operator-bundle:26.4.11-1*
Red Hat build of Keycloak 26.4RedHatrhbk/keycloak-rhel9:26.4-14*
Red Hat build of Keycloak 26.4RedHatrhbk/keycloak-rhel9-operator:26.4-14*
Red Hat build of Keycloak 26.4.11RedHatrhbk/keycloak-rhel9*
Red Hat Single Sign-On 7.6.13RedHatkeycloak-services*
Red Hat Single Sign-On 7.6 for RHEL 7RedHatrh-sso7-keycloak-0:18.0.20-1.redhat_00001.1.el7sso*
Red Hat Single Sign-On 7.6 for RHEL 8RedHatrh-sso7-keycloak-0:18.0.20-1.redhat_00001.1.el8sso*
Red Hat Single Sign-On 7.6 for RHEL 9RedHatrh-sso7-keycloak-0:18.0.20-1.redhat_00001.1.el9sso*
RHEL-8 based Middleware ContainersRedHatrh-sso-7/sso76-openshift-rhel8:7.6-85*

Extended Description

References

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