CVEvulnerability
CVE-2026-9801
4.9 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2026-05-28
- Last modified
- 2026-10-26
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 4.9 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-1284
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.
Affected configurations
• redhat build of keycloak
Related
Weakness · CWE (1)
- CWE-1284 Improper Validation of Specified Quantity in Input weakness
References
- 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/errata/RHSA-2026:30049 access.redhat.com
- https://access.redhat.com/errata/RHSA-2026:30050 access.redhat.com
- https://access.redhat.com/security/cve/CVE-2026-9801 Mitigation, Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2482473 Issue Tracking, Vendor Advisory