Keycloak-services: keycloak-services: unauthenticated dos via unbounded locale caching (Red Hat Red Hat build of Keycloak 26.4)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.81 % · percentile 57 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- redhat
- NVD status
- Awaiting Analysis
Description
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.
Weaknesses (CWE)
- CWE-400 — Uncontrolled Resource Consumption
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | redhat |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD · secalert@redhat.com (Secondary) |
European references
- ENISA EUVD · EUVD-2026-80830
- GCVE · GCVE-0-2026-79651
Affected products
| Product | Versions |
|---|---|
| Red Hat · Red Hat build of Keycloak 26.4 | unaffected 26.4.16-2 < * |
| Red Hat · Red Hat build of Keycloak 26.4 | unaffected 26.4-26 < * |
| Red Hat · Red Hat build of Keycloak 26.4 | unaffected 26.4-26 < * |
| Red Hat · Red Hat build of Keycloak 26.4.16 | |
| Red Hat · Red Hat build of Keycloak 26.4.16 | |
| Red Hat · Red Hat build of Keycloak 26.4.16 | |
| Red Hat · Red Hat build of Keycloak 26.6 | unaffected 26.6.7-3 < * |
| Red Hat · Red Hat build of Keycloak 26.6 | unaffected 26.6-20 < * |
| Red Hat · Red Hat build of Keycloak 26.6 | unaffected 26.6-20 < * |
| Red Hat · Red Hat build of Keycloak 26.6.7 | |
| Red Hat · Red Hat build of Keycloak 26.6.7 | |
| Red Hat · Red Hat build of Keycloak 26.6.7 | |
| Red Hat · Red Hat Single Sign-On 7 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |