Is CVE-2026-9801 actively exploited?

No active exploitation of CVE-2026-9801 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-9801 be exploited remotely?

Yes. CVE-2026-9801 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-9801?

CVE-2026-9801 has a CVSS score of 4.9 (MEDIUM).

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MEDIUM

CVE-2026-9801

CWE-1284Published: May 28, 2026· Updated: Jun 3, 2026

4.9

CVSS v3.1

EPSS:0.28%probability of exploitation in 30 daysPercentile:51.9th

Official 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.

NVD Source

Technical Analysis

CVE-2026-9801 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 4.9.