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Advisory record · GHSA-cpf7-j4cf-vqx4

Keycloak has an Out-of-bounds Read

CVSS 5.3 MediumEPSS 0.0042 · 36th 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-servicesMaven<=26.4.7 || >=26.5.0, <26.6.326.6.3
Identifiers
GHSA-cpf7-j4cf-vqx4 · CVE-2026-9803
Weakness (CWE)
CWE-125
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 org.keycloak:keycloak-services versions up to 26.4.7 and from 26.5.0 before 26.6.3 are vulnerable. A remote unauthenticated attacker can send a specially crafted POST request with a malformed Bearer Authorization header to a client registration endpoint, causing a server error and denial of service. 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
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0042, the 36th percentile, on 9 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.