A flaw was found in the X.509 client certificate authenticator of Keycloak. When CRL Distribution Point checking is enabled, the server fails to properly validate the file paths provided in a client certificate. An attacker can provide a specially crafted certificate that causes the server to attempt to read sensitive files from the local system or exhaust memory by loading extremely large files, potentially leading to information disclosure or a system crash.

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History

Thu, 01 Oct 2026 17:30:00 +0000

Type Values Removed Values Added
Description A flaw was found in the X.509 client certificate authenticator of Keycloak. When CRL Distribution Point checking is enabled, the server fails to properly validate the file paths provided in a client certificate. An attacker can provide a specially crafted certificate that causes the server to attempt to read sensitive files from the local system or exhaust memory by loading extremely large files, potentially leading to information disclosure or a system crash.
Title Keycloak-services: keycloak-services: path traversal in x.509 crl distribution point allows arbitrary local file read
First Time appeared Redhat
Redhat build Keycloak
Redhat red Hat Single Sign On
Weaknesses CWE-22
CPEs cpe:/a:redhat:build_keycloak:
cpe:/a:redhat:red_hat_single_sign_on:7
Vendors & Products Redhat
Redhat build Keycloak
Redhat red Hat Single Sign On
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-10-01T18:02:37.056Z

Reserved: 2026-10-01T13:22:41.176Z

Link: CVE-2026-103884

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-01T18:17:12.683

Modified: 2026-10-01T18:17:12.683

Link: CVE-2026-103884

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

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Weaknesses