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CVE-2026-4634
HIGH7.5
Description
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.
CVE Details
CVSS v3.1 Score7.5
SeverityHIGH
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack VectorNETWORK
ComplexityLOW
Privileges RequiredNONE
User InteractionNONE
Published4/2/2026
Last Modified4/3/2026
Sourcenvd
Honeypot Sightings0
Weaknesses (CWE)
CWE-1050
References
https://access.redhat.com/errata/RHSA-2026:6475(secalert@redhat.com)
https://access.redhat.com/errata/RHSA-2026:6476(secalert@redhat.com)
https://access.redhat.com/errata/RHSA-2026:6477(secalert@redhat.com)
https://access.redhat.com/errata/RHSA-2026:6478(secalert@redhat.com)
https://access.redhat.com/security/cve/CVE-2026-4634(secalert@redhat.com)
https://bugzilla.redhat.com/show_bug.cgi?id=2450250(secalert@redhat.com)
IOC Correlations
No correlations recorded
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