GitHub Advisoryadvisory · Maven
GHSA-f6r7-6w34-x2gp Keycloak Vulnerable to Improper Validation of Specified Quantity in Input
MEDIUM
Official page ↗
- Aliases
- CVE-2026-9801
- Ecosystem
- Maven
- Packages
- org.keycloak:keycloak-ldap-federation
- Severity
- Moderate
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-1284
- Reviewed
- 2026-07-01
Affected packages
• Maven org.keycloak:keycloak-ldap-federation: < 26.6.3 → fixed in 26.6.3
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.
Related
Alias · CVE (1)
- CVE-2026-9801 A flaw was found in Keycloak. vulnerability
Weakness · CWE (1)
- CWE-1284 Improper Validation of Specified Quantity in Input weakness
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-9801 advisory
- https://github.com/keycloak/keycloak/issues/49434 web
- https://github.com/keycloak/keycloak/pull/49514 web
- https://github.com/keycloak/keycloak/commit/2c4fe42235ba8c265b1da3a30541a270d5bd8c39 web
- https://access.redhat.com/errata/RHSA-2026:25097 web
- https://access.redhat.com/errata/RHSA-2026:25098 web
- https://access.redhat.com/errata/RHSA-2026:30049 web
- https://access.redhat.com/errata/RHSA-2026:30050 web
- https://access.redhat.com/security/cve/CVE-2026-9801 web
- https://bugzilla.redhat.com/show_bug.cgi?id=2482473 web
- https://github.com/keycloak/keycloak package