CVE-2024-11734: Keycloak quarkus server Denial of Service Vulnerability

MODERATE
Advisory Identifier: GHSA-w3g8-r9gw-qrh8
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CVSS 6.5
CWE-693
Published
Advisory Summary

CVE-2024-11734 is a MODERATE (CVSS 6.5) denial of service vulnerability (CWE-693: Protection Mechanism Failure) affecting Keycloak quarkus server libraries in the Maven ecosystem. The issue involves denial of service in keycloak server via security headers. Remediation is available by upgrading affected packages to version 26.0.8.

CVE-2024-11734 at a Glance

CVE Identifier CVE-2024-11734
GHSA Identifier GHSA-w3g8-r9gw-qrh8
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-693: Protection Mechanism Failure
Affected Product Keycloak quarkus server
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 6.5

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
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-2024-11734

To remediate this vulnerability, upgrade all affected Keycloak quarkus server 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-quarkus-server fixed: 26.0.8 
<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-quarkus-server</artifactId>
    <version>26.0.8</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-2024-11734, 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 quarkus server in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 26.0.8), 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-693: Protection Mechanism Failure, where the product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product. In Keycloak quarkus server, 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 potential Denial of Service (DoS) vulnerability has been identified in Keycloak, which could allow an administrative user with the rights to change realm settings to disrupt the service. This is done by modifying any of the security headers and inserting newlines, which causes the Keycloak server to write to a request that is already terminated, leading to a failure of said request. Service disruption may happen, users will be unable to access applications relying on Keycloak, or any of the consoles provided by Keycloak itself on the affected realm.

CVE-2024-11734 Affected Keycloak quarkus server Versions

1 component(s)
Fixed Versions:
26.0.8
Product / Package Ecosystem Affected Versions Fixed Version
org.keycloak:keycloak-quarkus-server
maven/org.keycloak/keycloak-quarkus-server
Maven
< 26.0.8
26.0.8

References

GitHub Advisory / Wiki ADVISORY
https://github.com/keycloak/keycloak/security/advisories/GHSA-w3g8-r9gw-qrh8
NVD — CVE-2024-11734 NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-11734
Security Fix Commit FIX COMMIT
https://github.com/keycloak/keycloak/commit/93b2a7327b2557eb132a8169086c5e63c81dff79
access.redhat.com/errata/rhsa-2025:02... WEB
https://access.redhat.com/errata/RHSA-2025:0299
access.redhat.com/errata/rhsa-2025:03... WEB
https://access.redhat.com/errata/RHSA-2025:0300
Keycloak quarkus server Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2024-11734
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2328846
Keycloak quarkus server Source Repository REPOSITORY
https://github.com/keycloak/keycloak

Frequently Asked Questions

What is CVE-2024-11734?
CVE-2024-11734 is a security vulnerability in Keycloak quarkus server involving Denial of Service in Keycloak Server via Security Headers under CWE-693: Protection Mechanism Failure.
Which Keycloak quarkus server versions are affected?
Affected versions include releases prior to 26.0.8 across affected packages: org.keycloak:keycloak-quarkus-server.
What version fixes CVE-2024-11734?
Upgrading to 26.0.8 (or the latest patched release for your respective branch) resolves the vulnerability.
Is keycloak-quarkus-server affected?
Yes, org.keycloak:keycloak-quarkus-server is affected in releases prior to 26.0.8. Upgrade your dependency to 26.0.8 or later.
What is the CVSS score of CVE-2024-11734?
CVE-2024-11734 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2024-11734?
CVE-2024-11734 is classified under CWE-693: Protection Mechanism Failure (The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.).
How can I check Maven dependencies for CVE-2024-11734?
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-w3g8-r9gw-qrh8",
  "modified" : "2025-01-14T16:38:57Z",
  "published" : "2025-01-13T16:58:23Z",
  "aliases" : [ "CVE-2024-11734" ],
  "summary" : "Denial of Service in Keycloak Server via Security Headers",
  "details" : "A potential Denial of Service (DoS) vulnerability has been identified in Keycloak, which could allow an administrative user with the rights to change realm settings to disrupt the service. This is done by modifying any of the security headers and inserting newlines, which causes the Keycloak server to write to a request that is already terminated, leading to a failure of said request.\n\nService disruption may happen, users will be unable to access applications relying on Keycloak, or any of the consoles provided by Keycloak itself on the affected realm.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.keycloak:keycloak-quarkus-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "26.0.8"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/keycloak/keycloak/security/advisories/GHSA-w3g8-r9gw-qrh8"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2024-11734"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/keycloak/keycloak/commit/93b2a7327b2557eb132a8169086c5e63c81dff79"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2025:0299"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2025:0300"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/security/cve/CVE-2024-11734"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2328846"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/keycloak/keycloak"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-693" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-01-13T16:58:23Z",
    "nvd_published_at" : "2025-01-14T09:15:19Z"
  }
}