Vulnerabilities in pkg:maven/org.keycloak/keycloak-ldap-federation

PACKAGE
Advisory Identifier: GHSA-f6r7-6w34-x2gp
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Advisory Summary

CVE-2026-9801 is a MODERATE (CVSS 4.9) keycloak vulnerable to improper validation vulnerability (CWE-1284: Improper Validation of Specified Quantity in Input) affecting Keycloak ldap federation libraries in the Maven ecosystem. The issue involves keycloak vulnerable to improper validation of specified quantity in input. Remediation is available by upgrading affected packages to version 26.6.3.

7 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:maven/org.keycloak/keycloak-ldap-federation

7 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:maven/org.keycloak/keycloak-ldap-federation. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-f6r7-6w34-x2gp CVE-2026-9801 MODERATE Keycloak Vulnerable to Improper Validation of Specified Quantity in Input
GHSA-4hx9-48xh-5mxr CVE-2025-13467 MODERATE Keycloak LDAP User Federation provider enables admin-triggered untrusted Java deserialization
GHSA-93vm-mqpw-8wh3 - MODERATE Duplicate Advisory: Keycloak LDAP User Federation provider enables admin-triggered untrusted Java deserialization
GHSA-m3hp-8546-5qmr - MODERATE Duplicate Advisory: Authentication Bypass Due to Missing LDAP Bind After Password Reset in Keycloak
GHSA-2p82-5wwr-43cw CVE-2025-0604 MODERATE Authentication Bypass Due to Missing LDAP Bind After Password Reset in Keycloak
GHSA-c25h-c27q-5qpv CVE-2024-5967 LOW Keycloak leaks configured LDAP bind credentials through the Keycloak admin console
GHSA-8hc5-rmgf-qx6p CVE-2022-2232 LOW Keycloak vulnerable to LDAP Injection on UsernameForm Login

CVE-2026-9801 at a Glance

CVE Identifier CVE-2026-9801
GHSA Identifier GHSA-f6r7-6w34-x2gp
Severity MODERATE
CVSS v3.1 Base Score 4.9
CWE Classification CWE-1284: Improper Validation of Specified Quantity in Input
Affected Product Keycloak ldap federation
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 4.9

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required High (PR:H)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2026-9801

To remediate this vulnerability, upgrade all affected Keycloak ldap federation dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.keycloak:keycloak-ldap-federation fixed: 26.6.3 
<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-ldap-federation</artifactId>
    <version>26.6.3</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.keycloak

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-9801, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.keycloak

Analyze the terminal output to locate any version of Keycloak ldap federation in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 26.6.3), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.keycloak command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-1284: Improper Validation of Specified Quantity in Input, where the product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties. In Keycloak ldap federation, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2026-9801 Affected Keycloak ldap federation Versions

1 component(s)
Fixed Versions:
26.6.3
Product / Package Ecosystem Affected Versions Fixed Version
org.keycloak:keycloak-ldap-federation
maven/org.keycloak/keycloak-ldap-federation
Maven
< 26.6.3
26.6.3

References

NVD — CVE-2026-9801 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-9801
Keycloak ldap federation Source Repository REPOSITORY
https://github.com/keycloak/keycloak/issues/49434
Keycloak ldap federation Source Repository REPOSITORY
https://github.com/keycloak/keycloak/pull/49514
Security Fix Commit FIX COMMIT
https://github.com/keycloak/keycloak/commit/2c4fe42235ba8c265b1da3a30541a270d5bd8c39
access.redhat.com/errata/rhsa-2026:25... WEB
https://access.redhat.com/errata/RHSA-2026:25097
access.redhat.com/errata/rhsa-2026:25... WEB
https://access.redhat.com/errata/RHSA-2026:25098
access.redhat.com/errata/rhsa-2026:30... WEB
https://access.redhat.com/errata/RHSA-2026:30049
access.redhat.com/errata/rhsa-2026:30... WEB
https://access.redhat.com/errata/RHSA-2026:30050
Keycloak ldap federation Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2026-9801
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2482473
Keycloak ldap federation Source Repository REPOSITORY
https://github.com/keycloak/keycloak

Frequently Asked Questions

What is CVE-2026-9801?
CVE-2026-9801 is a security vulnerability in Keycloak ldap federation involving Keycloak Vulnerable to Improper Validation of Specified Quantity in Input under CWE-1284: Improper Validation of Specified Quantity in Input.
Which Keycloak ldap federation versions are affected?
Affected versions include releases prior to 26.6.3 across affected packages: org.keycloak:keycloak-ldap-federation.
What version fixes CVE-2026-9801?
Upgrading to 26.6.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is keycloak-ldap-federation affected?
Yes, org.keycloak:keycloak-ldap-federation is affected in releases prior to 26.6.3. Upgrade your dependency to 26.6.3 or later.
What is the CVSS score of CVE-2026-9801?
CVE-2026-9801 has a CVSS v3.1 base score of 4.9 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-9801?
CVE-2026-9801 is classified under CWE-1284: Improper Validation of Specified Quantity in Input (The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties.).
How can I check Maven dependencies for CVE-2026-9801?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.keycloak'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-f6r7-6w34-x2gp",
  "modified" : "2026-07-01T21:26:37Z",
  "published" : "2026-05-28T06:31:10Z",
  "aliases" : [ "CVE-2026-9801" ],
  "summary" : "Keycloak Vulnerable to Improper Validation of Specified Quantity in Input",
  "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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.keycloak:keycloak-ldap-federation"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "26.6.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-9801"
  }, {
    "type" : "WEB",
    "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" : "PACKAGE",
    "url" : "https://github.com/keycloak/keycloak"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1284" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-01T21:26:37Z",
    "nvd_published_at" : "2026-05-28T06:16:29Z"
  }
}