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Advisory record · GHSA-f6r7-6w34-x2gp

Keycloak Vulnerable to Improper Validation of Specified Quantity in Input

CVSS 4.9 MediumEPSS 0.0048 · 41st percentile

Published by the GitHub Advisory Database at 28 May 2026, 06:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-ldap-federationMaven<26.6.326.6.3
Identifiers
GHSA-f6r7-6w34-x2gp · CVE-2026-9801
Weakness (CWE)
CWE-1284
Tags
Published
28 May 2026
Updated
1 Jul 2026

Machine-written summary

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

Keycloak's keycloak-ldap-federation package is affected in versions before 26.6.3. An attacker with high privileges, such as a realm administrator who configures a malicious LDAP server, or someone who has compromised an upstream LDAP server, can send a malformed LDAP password policy response during password authentication. This triggers an OutOfMemoryError that terminates the Keycloak JVM, causing a denial of service for all realms on the affected node. Upgrade to version 26.6.3.

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
4.9 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0048, the 41st percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:20 UTC First seen by agentprime
  2. 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.