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Fencer Vulns
medium 6.5

CVE-2024-11734 json

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

published 2025-01-13 21 mo ago modified 2026-09-10 1 mo ago also GHSA-w3g8-r9gw-qrh8 , EUVD-2025-0048

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 61%
public exploits
0
none known

Summary

A 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.

Patch / fix

  • maven org.keycloak:keycloak-quarkus-server 26.0.8
  • Red Hat Red Hat build of Keycloak 26.0 26.0-7, 26.0-8, 26.0.8-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-11734 updated cvss 6.5

org.keycloak:keycloak-quarkus-server: Denial of Service in Keycloak Server via Security Headers

  • Red Hat Build of Keycloak keycloak-quarkus-server
    affected: workaround, no fix planned “Will not fix”
  • Red Hat build of Keycloak 26.0 rhbk/keycloak-rhel9 26.0-7, rhbk/keycloak-rhel9-operator 26.0-8, rhbk/keycloak-operator-bundle 26.0.8-1
    fixed: vendor fix RHSA-2025:0299
  • Red Hat RHBK 26.0.8
    fixed: vendor fix RHSA-2025:0300
  • Red Hat JBoss Enterprise Application Platform 8 keycloak-quarkus-server Red Hat JBoss Enterprise Application Platform Expansion Pack keycloak-quarkus-server
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
21 mo ago

Exploit prediction

0.95% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven org.keycloak:keycloak-quarkus-server
<26.0.8
26.0.8

Affected products

  • Red Hat Red Hat build of Keycloak 26.0
  • Red Hat RHBK 26.0.8
  • Red Hat Red Hat Build of Keycloak
  • Red Hat Red Hat JBoss Enterprise Application Platform 8
  • Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack

Classification

Weakness
  • CWE-693 Protection Mechanism Failure

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.