Detecting CVE-2026-6653 attempts when the crash is the signal

CVE-2026-6653 is a use-after-free vulnerability in GNOME libxml2 versions 2.9.11 through those before 2.11.0. The flaw occurs in xmlParseInternalSubset due to improper entity resolution handling when parsing crafted XML documents. Detection is challenging because the observable outcome is a parser crash within error handling, specifically inside __xmlRaiseError or xmlFatalErr, rather than a distinctive payload string. To resolve this exposure and secure affected services, users must upgrade to libxml2 2.11.0 or later.