CVE-2026-9801
Last modified
CVE-2026-9801 is a medium-severity vulnerability rated 4.9/10 on the CVSS scale. 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. EPSS estimates a 0.44% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Redhat | Build Of Keycloak | All versions |
References
- https://access.redhat.com/security/cve/CVE-2026-9801Mitigation, Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2482473Issue Tracking, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-9801?
How severe is CVE-2026-9801?
How do I fix CVE-2026-9801?
Are you affected by CVE-2026-9801?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST