CVE-2026-9801
MEDIUMKeycloak: keycloak: denial of service via malformed ldap password policy response
Title source: cnaDescription
A flaw was found in Keycloak. A remote attacker with high privileges, such as a realm administrator configuring a malicious Lightweight Directory Access Protocol (LDAP) server or an attacker compromising an upstream LDAP server, could exploit this vulnerability. By sending a malformed LDAP password policy response during a password authentication request, the attacker can trigger an OutOfMemoryError. This causes the Keycloak Java Virtual Machine (JVM) to terminate, leading to a denial of service (DoS) for all realms on the affected node.
References (4)
Core 4
Core References
Vendor Advisory vendor-advisory
x_refsource_redhat
RHSA-2026:25097
https://access.redhat.com/errata/RHSA-2026:25097
Vendor Advisory vendor-advisory
x_refsource_redhat
RHSA-2026:25098
https://access.redhat.com/errata/RHSA-2026:25098
Vdb Entry, X_Refsource_Redhat vdb-entry
x_refsource_redhat
https://access.redhat.com/security/cve/CVE-2026-9801
Issue Tracking, X_Refsource_Redhat issue-tracking
x_refsource_redhat
RHBZ#2482473
https://bugzilla.redhat.com/show_bug.cgi?id=2482473
Scores
CVSS v3
4.9
EPSS
0.0044
EPSS Percentile
35.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-1284
Status
published
Products (5)
Red Hat/Red Hat Build of Keycloak
Red Hat/Red Hat build of Keycloak 26.6
26.6-6
Red Hat/Red Hat build of Keycloak 26.6
26.6.3-3
Red Hat/Red Hat build of Keycloak 26.6.3
redhat/build_of_keycloak
Published
May 28, 2026
Tracked Since
May 28, 2026