Org.keycloak:keycloak-quarkus-server: denial of service in keycloak server via security headers

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2024-11734
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-01-14 09:15:19 UTC
Updated2026-08-31 01:16:43 UTC
DescriptionA denial of service vulnerability was found in Keycloak that could allow an administrative user with the right to change realm settings to disrupt the service. This action is done by modifying any of the security headers and inserting newlines, which causes the Keycloak server to write to a request that has already been terminated, leading to the failure of said request.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.009430000 probability, percentile 0.576670000 (date 2026-08-06)

Problem Types: CWE-693 | CWE-693 Protection Mechanism Failure

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1CNACVSS6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Build Of Keycloak 26.0 unaffected 26.0.8-1 * rpm Not specified
CNA Red Hat Red Hat Build Of Keycloak 26.0 unaffected 26.0-7 * rpm Not specified
CNA Red Hat Red Hat Build Of Keycloak 26.0 unaffected 26.0-8 * rpm Not specified
CNA Red Hat RHBK 26.0.8 Not specified Not specified
CNA Red Hat Red Hat Build Of Keycloak Not specified Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 8 Not specified Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/errata/RHSA-2025:0299 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:0300 [email protected] access.redhat.com
access.redhat.com/security/cve/CVE-2024-11734 [email protected] access.redhat.com
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Red Hat would like to thank Chase Bowman (Contract Security) for reporting this issue. (en)

Additional Advisory Data

SourceTimeEvent
CNA2024-11-26T03:54:23.151ZReported to Red Hat.
CNA2025-01-13T12:22:00.000ZMade public.

Workarounds

CNA: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

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