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Fencer Vulns
high 7.5

CVE-2025-11419 json

Keycloak: keycloak tls client-initiated renegotiation denial of service

published 2025-10-27 12 mo ago modified 2026-10-19 20 d ago also GHSA-q8hq-4h99-fj7x , EUVD-2025-36356

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits
0
none known

Summary

A flaw was found in Keycloak. This vulnerability allows an unauthenticated remote attacker to cause a denial of service (DoS) by repeatedly initiating TLS 1.2 client-initiated renegotiation requests to exhaust server CPU resources, making the service unavailable.

Patch / fix

  • maven org.keycloak:keycloak-quarkus-dist 26.0.16, 26.2.10, 26.4.1
  • Red Hat Red Hat build of Keycloak 26.0 26.0-20, 26.0-21, 26.0.16-2
  • Red Hat Red Hat build of Keycloak 26.2 26.2-11, 26.2.10-2

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-2025-11419 updated cvss 7.5

keycloak: Keycloak TLS Client-Initiated Renegotiation Denial of Service

  • Red Hat build of Keycloak 26.0 rhbk/keycloak-rhel9 26.0-20, rhbk/keycloak-rhel9-operator 26.0-21, rhbk/keycloak-operator-bundle 26.0.16-2
    fixed: vendor fix RHSA-2025:18255
  • Red Hat build of Keycloak 26.0.16
    fixed: vendor fix RHSA-2025:18254
  • Red Hat build of Keycloak 26.2 rhbk/keycloak-rhel9 26.2-11, rhbk/keycloak-rhel9-operator 26.2-11, rhbk/keycloak-operator-bundle 26.2.10-2
    fixed: vendor fix RHSA-2025:18889
  • Red Hat build of Keycloak 26.2.10
    fixed: vendor fix RHSA-2025:18890

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
yes
Technical impact
partial
Assessed
10 mo ago

Exploit prediction

0.72% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven org.keycloak:keycloak-quarkus-dist
<26.0.16
>=26.1.0, <26.2.10
>=26.3.0, <26.4.1
26.0.16
26.2.10
26.4.1

Affected products

  • Red Hat Red Hat build of Keycloak 26.0
  • Red Hat Red Hat build of Keycloak 26.0.16
  • Red Hat Red Hat build of Keycloak 26.2
  • Red Hat Red Hat build of Keycloak 26.2.10

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling
  • CWE-400 Uncontrolled Resource Consumption

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.