CVE-2026-79651Keycloak-services: keycloak-services: unauthenticated dos via unbounded locale caching
Updated under an hour ago ()
Does this affect you?
It affects Red Hat build of Keycloak 26.4 and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-400
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Awaiting Analysis
- Record last updated
- Sep 25, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Red Hat Red Hat build of Keycloak 26.4 redhat:build_keycloak | from 26.4.16-2 not affected | CNA record |
Red Hat Red Hat Single Sign-On 7 redhat:red_hat_single_sign_on | 7 | CNA record |
References
- https://access.redhat.com/errata/RHSA-2026:68276vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:68277vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:68278vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:68280vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2026-79651vdb-entry, x-refsource-redhat
- https://bugzilla.redhat.com/show_bug.cgi?id=2523345issue-tracking, x-refsource-redhat
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.