CVE-2026-50455 in Windows
Summary
by MITRE • 07/14/2026
Use of uninitialized resource in Universal Plug and Play (upnp.dll) allows an authorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 07/14/2026
The vulnerability described represents a critical security flaw within the Universal Plug and Play implementation on Windows systems, specifically within the upnp.dll library. This issue stems from the improper initialization of system resources during the processing of UPnP network communications, creating an avenue for information disclosure attacks. The flaw exists in how the system handles resource allocation and management when processing UPnP protocols, particularly affecting the local information disclosure capabilities of authenticated attackers who can leverage this vulnerability to extract sensitive data from the target system.
The technical root cause of this vulnerability lies in the failure to properly initialize memory or system resources before their usage within the upnp.dll component. This uninitialized resource access creates a condition where attackers can potentially read memory contents that contain sensitive information such as system credentials, network configurations, or other confidential data stored in memory locations that have not been properly cleared or initialized. The vulnerability specifically impacts systems running Windows operating systems where UPnP functionality is enabled and actively utilized.
From an operational perspective, this vulnerability poses significant risks to enterprise security environments where UPnP services are commonly enabled for device discovery and network management purposes. An attacker with local access to a system can exploit this weakness to gather sensitive information that could be used for further exploitation attempts including privilege escalation, lateral movement within the network, or targeted attacks against other systems. The local nature of this vulnerability means that it requires physical or authenticated access to the target machine but does not necessitate network-based attack vectors, making it particularly concerning for environments where system integrity is paramount.
The impact of this information disclosure vulnerability extends beyond immediate data exposure as it can provide attackers with valuable reconnaissance information that may be used to craft more sophisticated attacks. Security researchers have identified this issue as aligning with CWE-457 which covers "Use of Uninitialized Variable" and potentially relates to ATT&CK technique T1082 for system information discovery and T1069 for permission groups discovery. Organizations should consider implementing comprehensive monitoring solutions to detect anomalous UPnP activity patterns that may indicate exploitation attempts.
Mitigation strategies should prioritize the immediate application of Microsoft security patches and updates that address this specific vulnerability within upnp.dll. System administrators should also implement strict network segmentation policies to limit UPnP service exposure, disable unnecessary UPnP functionality on systems where it is not required, and conduct thorough security audits to identify all instances of UPnP service activation throughout the enterprise environment. Additionally, implementing memory protection mechanisms such as address space layout randomization and data execution prevention can help reduce the exploitability of uninitialized resource vulnerabilities while maintaining system functionality.