CVE-2026-45205

A flaw was found in Apache Commons Configuration. When processing an untrusted configuration file, a remote attacker could provide specially crafted YAML input with cycles. This could lead to an uncontrolled recursion, causing a StackOverflowError and resulting in a Denial of Service (DoS) for the affected system.

This Important flaw in Apache Commons Configuration allows a remote attacker to trigger a denial of service by providing specially crafted YAML input containing cycles. This can lead to an uncontrolled recursion and a StackOverflowError, impacting the availability of systems that process untrusted YAML configuration files.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, restrict Apache Commons Configuration to process only trusted YAML configuration files. Implement strict input validation for any YAML content originating from untrusted sources to prevent the parsing of malformed input with cyclical references. This operational control reduces the exposure to denial of service attacks.