Resource exhaustion in Red Hat Build Of Keycloak
CVE-2026-79651
A flaw was found in the theme localization endpoints of the keycloak-services component, which is the core service responsible for authentication flows and theme management in Keycloak. The issue occurs because the system accepts arbitrary locale tags from unauthenticated requests and stores them in a permanent in-memory cache without limits. An attacker can exploit this by sending a large number of unique locale tags, eventually causing the server to run out of memory and crash.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.008 (56.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-79651 (vdb-entry)
- RHBZ#2523345 (issue-tracking)
- RHSA-2026:68276 (vendor-advisory)
- RHSA-2026:68277 (vendor-advisory)
- RHSA-2026:68278 (vendor-advisory)
- RHSA-2026:68280 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-79651?
- CVE-2026-79651 is a high-severity vulnerability in Red Hat Build Of Keycloak, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-09-16.
- How severe is CVE-2026-79651?
- High severity. CVSS v3 base score is 7.5 out of 10.