What is CVE-2026-103884?

CVE-2026-103884 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under Path Traversal. CVSS score: 6.5/10. Published 2026-10-01.

How severe is CVE-2026-103884?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Path Traversal in Red Hat Build Of Keycloak

CVE-2026-103884

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.

Vulnerability class: Path Traversal (Directory Traversal)

Published 2026-10-01 · last modified 2026-10-01.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-22 — Path Traversal

References

access.redhat.com/security/cve/CVE-2026-103884 (vdb-entry)

Frequently asked questions

What is CVE-2026-103884?: CVE-2026-103884 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under Path Traversal. CVSS score: 6.5/10. Published 2026-10-01.
How severe is CVE-2026-103884?: Medium severity. CVSS v3 base score is 6.5 out of 10.