The vulnerability identified as CVE-2026-56859 in the Go standard library encoding/xml package involves improper handling of the depth counter in the DecodeElement function. Previously, the function would reset the depth counter, causing it never to fire and thus failing to limit resource allocation. This can result in stack exhaustion due to unbounded recursion or resource use when parsing XML. The affected versions include all versions before 1.25.13, version 1.26.0-0, versions from 1.26.0-0 up to but excluding 1.26.6, and version 1.27.0-0. No CVSS score or vendor advisory patch information is currently available, and no known active exploitation has been reported.

The vulnerability can cause stack exhaustion in applications using the affected versions of the Go encoding/xml package, potentially leading to denial of service or application crashes due to resource exhaustion. There is no evidence of active exploitation in the wild.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider mitigating risk by limiting exposure to untrusted XML input or applying application-level resource constraints. Monitor official Go project communications for updates on patches or workarounds.