Allocation of Resources Without Limits in Keycloak
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 software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.keycloak:keycloak-model-jpa | < 21.0.0 | 21.0.0 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2023-6563
- https://github.com/keycloak/keycloak/issues/13340
- https://github.com/keycloak/keycloak/pull/15463
- https://github.com/keycloak/keycloak/commit/556146f961f7c8ddf64de15e2117a58d045f72b5
- https://access.redhat.com/errata/RHSA-2023:7854
- https://access.redhat.com/errata/RHSA-2023:7855
- https://access.redhat.com/errata/RHSA-2023:7856
- https://access.redhat.com/errata/RHSA-2023:7857
- https://access.redhat.com/errata/RHSA-2023:7858
- https://access.redhat.com/security/cve/CVE-2023-6563
- https://bugzilla.redhat.com/show_bug.cgi?id=2253308
- https://github.com/keycloak/keycloak
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H- Weakness (CWE)
CWE-770- Platform
- Java / Kotlin (Maven)
- Package
org.keycloak:keycloak-model-jpa- Disclosed
- 14.12.2023
- Updated
- 11.10.2026 11:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-54f3-c6hg-865h - CC BY 4.0
Vulnerability history: org.keycloak:keycloak-model-jpa
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 3
- First → latest
- 05.2022 03.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 2
- Medium 1
Disclosures per year
- 2022: 1
- 2023: 1
- 2024: 0
- 2025: 0
- 2026: 1
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