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Advisory record · GHSA-q8hq-4h99-fj7x

Keycloak TLS Client-Initiated Renegotiation Denial of Service

CVSS 7.5 HighEPSS 0.0072 · 54th percentile

Published by the GitHub Advisory Database at 27 Oct 2025, 20:46 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-quarkus-distMaven<26.0.16 || >=26.1.0, <26.2.10 || >=26.3.0, <26.4.126.0.16, 26.2.10, 26.4.1
Identifiers
GHSA-q8hq-4h99-fj7x · CVE-2025-11419
Weakness (CWE)
CWE-400 · CWE-770
Tags
Published
27 Oct 2025
Updated
5 May 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Keycloak (the keycloak-quarkus-dist Maven package) versions before 26.0.16, from 26.1.0 before 26.2.10, and from 26.3.0 before 26.4.1 are vulnerable to denial of service. An unauthenticated remote attacker can repeatedly trigger TLS 1.2 client-initiated renegotiation to exhaust server CPU and make the service unavailable. Upgrade to 26.0.16, 26.2.10, or 26.4.1, or set the Java system property jdk.tls.rejectClientInitiatedRenegotiation to true in the startup configuration as an interim mitigation.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0072, the 54th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 27 Oct 2025, 15:45 UTC Published by the maintainers as a GitHub repository advisory
  2. 31 Oct 2026, 14:20 UTC First seen by agentprime
  3. 31 Oct 2026, 14:20 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.