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Advisory record · GHSA-h4wv-g838-66g3

Keycloak: Application-Level DoS via Scope Processing

CVSS 7.5 HighEPSS 0.0064 · 50th percentile

Published by the GitHub Advisory Database at 2 Apr 2026, 15:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-servicesMaven<26.5.726.5.7
Identifiers
GHSA-h4wv-g838-66g3 · BIT-keycloak-2026-4634 · CVE-2026-4634
Weakness (CWE)
CWE-1050
Tags
Published
2 Apr 2026
Updated
10 Sept 2026

Machine-written summary

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

Keycloak's org.keycloak:keycloak-services package is affected in versions before 26.5.7. An unauthenticated attacker can send a crafted POST request with an excessively long scope parameter to the OIDC token endpoint, causing high resource consumption and long processing times that can lead to a denial of service. Upgrade to version 26.5.7, which is the fixed version.

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
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 0.0064, the 50th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:17 UTC First seen by agentprime
  2. 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.