CVE-2026-9801— Keycloak: keycloak: denial of service via malformed ldap password policy response
Possible ATT&CK Techniques 1AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat Build of Keycloak | any | affected |
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I. Basic Information for CVE-2026-9801
Vulnerability Information
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Vulnerability Title
Keycloak: keycloak: denial of service via malformed ldap password policy response
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
CWE-1284
Source: NVD (National Vulnerability Database)
Vulnerability Title
Keycloak 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keycloak是Keycloak开源的一种开源身份和访问管理解决方案。 Keycloak存在安全漏洞，该漏洞源于具有高权限的远程攻击者（如配置恶意LDAP服务器的领域管理员或攻击者破坏上游LDAP服务器）可通过在密码身份验证请求期间发送格式错误的LDAP密码策略响应，触发OutOfMemoryError，可能导致Keycloak Java虚拟机终止，从而导致受影响节点上所有领域的拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat Build of Keycloak | - | cpe:/a:redhat:build_keycloak: |
II. Public POCs for CVE-2026-9801
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-9801 (1)
Other References for CVE-2026-9801 (1)
Same Patch Batch · Red Hat · 2026-05-28 · 14 CVEs total
| CVE-2026-4408 | 9.0 CRITICAL | Samba: remote code execution in samr |
| CVE-2026-9804 | 7.7 HIGH | Kubevirt: kubevirt: vmexport directory symlink escape enables exporter pod file read |
| CVE-2026-9795 | 7.3 HIGH | Keycloak: keycloak: privilege escalation via improper scope mapping enforcement |
| CVE-2026-44604 | 7.0 HIGH | Rpm: command injection in rpmuncompress dountar() via unescaped archive top-level director |
| CVE-2026-9802 | 6.8 MEDIUM | Keycloak: keycloak: unauthorized account access via replayed refresh tokens after cluster |
| CVE-2026-9792 | 6.5 MEDIUM | Keycloak: keycloak: security restriction bypass allows unauthorized ropc token acquisition |
| CVE-2026-9796 | 6.5 MEDIUM | Keycloak: keycloak: privilege escalation via time-of-check to time-of-use (toctou) vulnera |
| CVE-2026-9793 | 5.9 MEDIUM | Keycloak: keycloak: security policy bypass in jwe-encrypted request object processing |
| CVE-2026-9794 | 5.3 MEDIUM | Keycloak: keycloak: information disclosure via saml ecp endpoint |
| CVE-2026-9803 | 5.3 MEDIUM | Keycloak: keycloak: denial of service via malformed authorization header |
| CVE-2026-9791 | 4.3 MEDIUM | Keycloak-rhel9: organization data leak after feature disabled in keycloak |
| CVE-2026-9798 | 4.3 MEDIUM | Keycloak: keycloak: brute-force protection bypass in ciba flow |
| CVE-2026-10028 | 4.3 MEDIUM | Glib-networking: infinite loop in glib-networking gnutls backend allows remote denial of s |
IV. Related Vulnerabilities
Same product: Red Hat Build of Keycloak
- CVE-2026-9802
Keycloak: keycloak: unauthorized account access via replayed - CVE-2026-9803
Keycloak: keycloak: denial of service via malformed authoriz - CVE-2026-9798
Keycloak: keycloak: brute-force protection bypass in ciba fl - CVE-2026-9796
Keycloak: keycloak: privilege escalation via time-of-check t - CVE-2026-9795
Keycloak: keycloak: privilege escalation via improper scope
Same vendor: Red Hat
- CVE-2026-1784
Ose-cluster-ingress-operator: remote code execution through - CVE-2026-5419
Guntls: gnutls: information disclosure via timing side-chann - CVE-2026-43958
Rrdtool: rrdtool: stack buffer overflow allows local code ex - CVE-2026-10118
Poppler: integer overflow in poppler splashoutputdev::tiling - CVE-2026-10533
Openshift: openshift: non-admin user can bypass resourcequot
Same weakness: CWE-1284
- CVE-2026-47329
Incorrect validation of field size in Ubuntu Linux AppArmor - CVE-2026-7254
Open BMC Denial of Service - CVE-2026-9704
Keycloak: keycloak: privilege escalation due to oversized su - CVE-2026-3676
There are multiple vulnerabilities in IBM DB2 bundled with I - CVE-2026-42744
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