CVE-2026-19729: Keycloak-services: keycloak-services: incomplete fix for arbitrary filesystem path probing via keystore parameters

Severity: medium (CVSS 4.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-09 · updated 2026-09-16
Weakness: CWE-22

Description

A flaw was found in the key provider component of the keycloak-services library, which is the core engine for the Red Hat Build of Keycloak. The issue occurs because a previous fix for path probing was incomplete, allowing a realm administrator to still submit arbitrary filesystem paths as keystore parameters. This can be used to determine the existence and readability of files on the server, potentially exposing sensitive system information.

Affected products

Red Hat build of Keycloak 26.4: all versions — fixed in 26.4-26, 26.4.16-2, 26.6-20, 26.6.7-3

How to fix

Upgrade to a fixed version: Red Hat build of Keycloak 26.4 26.4-26, 26.4.16-2, 26.6-20, 26.6.7-3. Check the vendor advisory for mitigations.

References

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