{
"id": "GHSA-f6r7-6w34-x2gp",
"aliases": [
"CVE-2026-9801"
],
"details": "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.",
"summary": "Keycloak Vulnerable to Improper Validation of Specified Quantity in Input",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "26.6.3"
}
]
}
],
"package": {
"name": "org.keycloak:keycloak-ldap-federation",
"ecosystem": "Maven"
}
}
],
"modified": "2026-07-01T21:26:37Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H"
}
],
"published": "2026-05-28T06:31:10Z",
"references": [
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9801",
"type": "ADVISORY"
},
{
"url": "https://github.com/keycloak/keycloak/issues/49434",
"type": "WEB"
},
{
"url": "https://github.com/keycloak/keycloak/pull/49514",
"type": "WEB"
},
{
"url": "https://github.com/keycloak/keycloak/commit/2c4fe42235ba8c265b1da3a30541a270d5bd8c39",
"type": "WEB"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:25097",
"type": "WEB"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:25098",
"type": "WEB"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:30049",
"type": "WEB"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:30050",
"type": "WEB"
},
{
"url": "https://access.redhat.com/security/cve/CVE-2026-9801",
"type": "WEB"
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482473",
"type": "WEB"
},
{
"url": "https://github.com/keycloak/keycloak",
"type": "PACKAGE"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-1284"
],
"severity": "MODERATE",
"github_reviewed": true,
"nvd_published_at": "2026-05-28T06:16:29Z",
"github_reviewed_at": "2026-07-01T21:26:37Z"
}
}