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Description

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.

PUBLISHED Reserved 2025-10-07 | Published 2025-12-23 | Updated 2025-12-23 | Assigner redhat




HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

Allocation of Resources Without Limits or Throttling

Product status

Default status
unaffected

Any version before 26.0.16
affected

26.1.0 (semver) before 26.1.*
unknown

26.2.0 (semver) before 26.2.10
affected

26.3.0 (semver) before 26.3.*
unknown

26.4.0 (semver) before 26.4.1
affected

Default status
affected

26.0.16-2 (rpm) before *
unaffected

Default status
affected

26.0-20 (rpm) before *
unaffected

Default status
affected

26.0-21 (rpm) before *
unaffected

Default status
unaffected

Default status
affected

26.2.10-2 (rpm) before *
unaffected

Default status
affected

26.2-11 (rpm) before *
unaffected

Default status
affected

26.2-11 (rpm) before *
unaffected

Default status
unaffected

Timeline

2025-10-07:Reported to Red Hat.
2025-10-07:Made public.

References

access.redhat.com/errata/RHSA-2025:18254 (RHSA-2025:18254) vendor-advisory

access.redhat.com/errata/RHSA-2025:18255 (RHSA-2025:18255) vendor-advisory

access.redhat.com/errata/RHSA-2025:18889 (RHSA-2025:18889) vendor-advisory

access.redhat.com/errata/RHSA-2025:18890 (RHSA-2025:18890) vendor-advisory

access.redhat.com/security/cve/CVE-2025-11419 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2402142 (RHBZ#2402142) issue-tracking

cve.org (CVE-2025-11419)

nvd.nist.gov (CVE-2025-11419)

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Data based on CVE®. Copyright © 1999-2025, The MITRE Corporation. All rights reserved.