7.5 High

CVE-2026-110932 Keycloak-services: keycloak-services: unauthenticated persistent disk exhaustion via theme gzip cache

Description

A flaw was found in the theme resource endpoint of Keycloak, an open-source identity and access management solution. The issue occurs because the server fails to validate theme names before using them as keys for an on-disk gzip cache. An unauthenticated attacker can exploit this by sending many requests with unique, fabricated theme names, leading to persistent disk space exhaustion that survives server restarts and causes service disruptions.

CVSS 3.1 detail

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

Exploitable remotely over the network, without an account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector: Network
Attack complexity: Low
Privileges required: None
Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Affected products and versions

Product	Affected versions	Fixed in
Red Hat Build of Keycloak	Versions not published
Red Hat Single Sign-On 7	Versions not published

References

access.redhat.com access.redhat.com
RHBZ#2553049 bugzilla.redhat.com

Timeline

Published November 5, 2026
Last modified November 5, 2026

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