CVE-2026-79651
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat build of Keycloak 26.4 | 26.4.16-2 < * | unaffected |
| Red Hat | Red Hat build of Keycloak 26.4 | 26.4-26 < * | unaffected |
| Red Hat | Red Hat build of Keycloak 26.4 | 26.4-26 < * | unaffected |
| Red Hat | Red Hat build of Keycloak 26.6 | 26.6.7-3 < * | unaffected |
| Red Hat | Red Hat build of Keycloak 26.6 | 26.6-20 < * | unaffected |
| Red Hat | Red Hat build of Keycloak 26.6 | 26.6-20 < * | unaffected |
Weaknesses
- CWE-400: Uncontrolled Resource Consumption
Workarounds
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: yes
- Technical Impact: partial
References
- https://access.redhat.com/errata/RHSA-2026:68276
- https://access.redhat.com/errata/RHSA-2026:68277
- https://access.redhat.com/errata/RHSA-2026:68278
- https://access.redhat.com/errata/RHSA-2026:68280
- https://access.redhat.com/security/cve/CVE-2026-79651
- https://bugzilla.redhat.com/show_bug.cgi?id=2523345
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