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Advisory record · GHSA-w3g8-r9gw-qrh8

Denial of Service in Keycloak Server via Security Headers

CVSS 6.5 MediumEPSS 0.0095 · 61st percentile

Published by the GitHub Advisory Database at 13 Jan 2025, 16:58 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-quarkus-serverMaven<26.0.826.0.8
Identifiers
GHSA-w3g8-r9gw-qrh8 · CVE-2024-11734
Weakness (CWE)
CWE-693
Tags
Published
13 Jan 2025
Updated
10 Sept 2026

Machine-written summary

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

Keycloak Server (org.keycloak:keycloak-quarkus-server, Maven) versions before 26.0.8 are vulnerable. An attacker with administrative rights to change realm settings can set security headers containing newlines, causing requests to fail and disrupting access to applications and consoles on the affected realm. Upgrade to version 26.0.8 or later.

Written 2 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
6.5 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0095, the 61st percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 13 Jan 2025, 16:31 UTC Published by the maintainers as a GitHub repository advisory
  2. 31 Oct 2026, 14:17 UTC First seen by agentprime
  3. 31 Oct 2026, 14:17 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.