CVE-2026-79651 Keycloak keycloak-services - Denial of Service

Keycloak keycloak-services contains a denial of service caused by unrestricted caching of arbitrary locale tags from unauthenticated requests in theme localization endpoints, letting attackers crash the server by exhausting memory, exploit requires no authentication.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.81% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
16 September 2026
Updated
15 October 2026
Weakness
CWE-400

Vendor fix

Update to the latest version with the fix for unrestricted locale tag caching.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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