Red HatCVE-2026-16100
Red Hat user-event metrics recording of Keycloak.: resource exhaustion
Medium6.5CVE-2026-16100 · Published Aug 5, 2026 · updated Aug 31, 2026
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.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Red Hat Data Grid 8 Product | all versions | No fix yet |
| Red Hat JBoss Enterprise Application Platform Expansion Pack Product | all versions | No fix yet |
| Red Hat Single Sign-On 7 Product | all versions | No fix yet |
| Red Hat build of Keycloak 26.6.5 Product | all versions | No fix yet |
| all versions | No fix yet | |
| all versions | No fix yet |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-770
More Red Hat advisories
All Red Hat| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Aug 5 | Red Hat Enterprise Linux 10: integer overflow | Low2.2 | No fix yet |
| Aug 5 | Red Hat RPM: buffer overflow | Medium5.5 | No fix yet |
| Aug 5 | Red Hat OpenShift Container Platform 4: authentication bypass | Medium6.5 | No fix yet |
| Aug 5 | Red Hat SAML broker: origin validation error | High7.4 | No fix yet |
| Aug 5 | Red Hat Keycloak: type confusion | High8.8 | No fix yet |
| Aug 5 | Red Hat LDAP storage provider of Keycloak: improper privilege management | Medium5.4 | No fix yet |