CVE-2026-79651: DoS (CVSS 7.5)

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.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

References

Other 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

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-79651? +

CVE-2026-79651 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2026-79651? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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