CVE-2026-9801
MEDIUM EPSS 37.6%
Published May 28, 20261mo ago · Modified Jun 17, 20261w ago
4.9 CVSS 3.1
Published May 28, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago
Description
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H Attack Vector Network
Attack Complexity Low
Privileges Required High
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High
Threat Intelligence
EPSS Exploit Probability
37.6% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-1284
Affected Products 1
| Vendor | Product | Version | Range |
|---|---|---|---|
| redhat | build_of_keycloak | * | any |
References 4
- access.redhat.com https://access.redhat.com/errata/RHSA-2026:25097
- access.redhat.com https://access.redhat.com/errata/RHSA-2026:25098
- access.redhat.com https://access.redhat.com/security/cve/CVE-2026-9801
- bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2482473
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.