CVE-2026-16100
Medium
Description
A flaw was found in the user-event metrics recording of Keycloak. When metrics are enabled, the system records raw error messages from failed account operations as Prometheus metric labels. Because these error messages can include user-supplied input like nonexistent client IDs, an authenticated user can create a massive number of unique metric entries, eventually exhausting system memory and causing the service to crash or become unavailable.
SeverityMedium
CVSS6.5
Exploit probability—
Product
Redhat Build Of Keycloak
PublishedAug 5, 2026
First seenAug 5, 2026
Weakness typeCWE-770Allocation of resources without limits
How to fix
Update
- redhat build_of_keycloak26.6.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| redhat build_of_keycloak | 26.6 ≤ v < 26.6.5 | 26.6.5 |
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