GHSA-f6r7-6w34-x2gp
Keycloak Vulnerable to Improper Validation of Specified Quantity in Input
At a glance
- Published
- Updated
- CVE
- CVE-2026-9801
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
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 packages
| Package | Versions |
|---|---|
| Maven · org.keycloak:keycloak-ldap-federation | introduced 0, fixed 26.6.3 |
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
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |