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7.7 High

CVE-2023-6563 An unconstrained memory consumption vulnerability was discovered in Keycloak

Description

An unconstrained memory consumption vulnerability was discovered in Keycloak. It can be triggered in environments which have millions of offline tokens (> 500,000 users with each having at least 2 saved sessions). If an attacker creates two or more user sessions and then open the "consents" tab of the admin User Interface, the UI attempts to load a huge number of offline client sessions leading to excessive memory and CPU consumption which could potentially crash the entire system.

Affected products and versions

Product Affected versions Fixed in
Red Hat Single Sign-On 7.6 for RHEL 7 Versions not published
Red Hat Single Sign-On 7.6 for RHEL 8 Versions not published
Red Hat Single Sign-On 7.6 for RHEL 9 Versions not published
RHEL-8 based Middleware Containers 7.6 earliest → < 7.6.6-2 7.6.6-2
Single Sign-On 7.6.6 Versions not published
Red Hat Build of Keycloak Versions not published

References

Timeline

  1. Published
  2. Last modified

Other CVEs of Red Hat Single Sign-On 7.6 for RHEL 7

The 32 CVEs of Red Hat Single Sign-On 7.6 for RHEL 7 →
CVE-2026-15563 A flaw was found in EAP's IIOP 7.4 High CVE-2026-7507 A session fixation vulnerability was found in Keycloak's login-actions endpoints 7.5 High CVE-2026-7307 A flaw was found in Keycloak 7.5 High CVE-2026-4634 A flaw was found in Keycloak 7.5 High
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