CVE-2026-58016 in GLib
Summary
by MITRE • 06/30/2026
A flaw was found in GLib. A state confusion issue exists in g_dbus_node_info_new_for_xml() in the gio/gdbusintrospection.c file when processing malformed D-Bus introspection XML, specifically with a element nested within other elements like , , or . This issue can cause an unsigned integer overflow and lead to an out-of-bounds read, resulting in a denial of service.
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Analysis
by VulDB Data Team • 06/30/2026
The vulnerability resides within the g_dbus_node_info_new_for_xml() function in GLib's gio/gdbusintrospection.c file, where improper handling of malformed D-Bus introspection XML triggers a state confusion issue. This flaw specifically manifests when processing XML elements with nested structures, particularly when a element appears within other elements such as , , or . The vulnerability represents a classic example of improper input validation that can lead to memory safety issues in system libraries used extensively across Linux desktop environments and server applications.
The technical implementation of this vulnerability involves an unsigned integer overflow condition that occurs during XML parsing operations. When the parser encounters malformed nested elements, it fails to properly validate the integer values used for memory allocation calculations, leading to an unsigned integer overflow. This overflow subsequently results in an out-of-bounds read operation, where the application attempts to access memory locations beyond the allocated buffer boundaries. The underlying cause aligns with CWE-190, which identifies integer overflow and underflow vulnerabilities as critical security flaws that can lead to memory corruption.
Operationally, this vulnerability presents a significant denial of service risk for applications relying on GLib's D-Bus introspection capabilities. Systems utilizing desktop environments like GNOME, server applications using D-Bus communication protocols, or any software leveraging GLib's gio library components could become vulnerable to crashes or system instability when processing maliciously crafted D-Bus XML data. The impact extends beyond simple service disruption as attackers could potentially exploit this weakness in conjunction with other vulnerabilities to achieve more severe outcomes including arbitrary code execution within the context of affected applications.
Mitigation strategies should prioritize immediate patching of GLib versions containing this vulnerability, with administrators monitoring for updates from their distribution vendors. Additionally, implementing proper XML validation routines and input sanitization measures can help prevent exploitation attempts. The ATT&CK framework categorizes this vulnerability under T1203, which covers Exploitation for Execution, though the current impact is limited to denial of service rather than privilege escalation. Organizations should also consider deploying network segmentation and application whitelisting policies to limit potential attack surfaces where D-Bus communication occurs, particularly in enterprise environments where multiple applications may interact through these interfaces.