CVE-2026-103884 Keycloak-services: keycloak-services: path traversal in x.509 crl distribution point allows arbitrary local file read
Attackers can read local files or crash the server via crafted certificates when CRL checking is enabled in Keycloak.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-103884?
CVE-2026-103884 is a medium-severity path traversal vulnerability in Red Hat Build of Keycloak, published on 1 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-22
Which versions are affected by CVE-2026-103884?
How do I fix CVE-2026-103884?
No fix has been published for CVE-2026-103884 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-103884 being exploited?
There is no known exploitation of CVE-2026-103884 in the wild and no public exploit code.
Sources
Also known as GHSA-xfh5-8fx4-3crm.