CVE-2026-97832 in Windows
Summary
by MITRE • 10/14/2026
Out-of-bounds read in DNS Server allows an authorized attacker to disclose information over a network.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability described constitutes a critical security flaw within the Domain Name System (DNS) server infrastructure, specifically categorized as an out-of-bounds read error. This type of memory corruption issue arises when the software attempts to access data at a memory location that is outside the boundaries of the intended buffer or array structure. In the context of DNS servers, which are fundamental components of internet connectivity responsible for resolving domain names into IP addresses, such flaws can have severe implications for system stability and information confidentiality. The root cause typically involves insufficient validation of input parameters or packet structures received from network requests, allowing a crafted query to trigger an access violation that reads memory contents beyond the allocated space.
From a technical perspective, this vulnerability falls under the Common Weakness Enumeration (CWE) category CWE-125, which defines out-of-bounds read vulnerabilities. These flaws occur when software reads data past the end or before the beginning of a buffer without proper bounds checking. In DNS implementations, this often happens during the parsing of resource records or header fields where length values are not rigorously validated against actual packet sizes. When an attacker sends a specially crafted DNS query with malformed headers or oversized record sections, the server may attempt to read memory locations that contain sensitive operational data, such as internal pointers, stack variables, or other process information. This behavior is distinct from out-of-bounds writes because it does not immediately allow for code execution but serves primarily as an information disclosure vector.
The operational impact of this vulnerability centers on unauthorized information disclosure by an authenticated actor. The prompt specifies that the attacker must be authorized, which implies they possess valid credentials or are within a trusted network segment capable of interacting with the DNS service. Despite this authentication requirement, the ability to read arbitrary memory contents can lead to significant security breaches. Disclosed data may include cryptographic keys used for zone transfers or secure communications, internal hostnames and IP addresses that reveal network topology, or even parts of other users' queries if the server handles multiple concurrent requests in shared memory spaces. This information can be leveraged by attackers to plan further attacks, such as targeted phishing campaigns against specific employees identified through DNS logs or exploiting related services running on exposed hosts within the internal network.
In terms of threat modeling and adversary behavior, this vulnerability aligns with techniques found in the MITRE ATT&CK framework, particularly those related to Collection via Network Sniffing or Data from Information Repositories if the disclosed memory contains cached query data. It also relates to Discovery tactics where attackers gather information about the environment before proceeding to lateral movement. The presence of an out-of-bounds read indicates a lack of robust input sanitization and boundary checks in the DNS server's packet processing logic, highlighting gaps in secure coding practices during development or maintenance phases.
Mitigation strategies for this vulnerability require both immediate remediation and long-term architectural improvements. Organizations should apply vendor-provided security patches that address the specific memory access issues within the DNS software version affected. If patching is not immediately feasible, network segmentation can help limit exposure by restricting which hosts are authorized to send queries directly to critical DNS servers. Additionally, implementing strict input validation at the application layer and deploying intrusion detection systems configured to identify anomalous DNS packet structures can provide an additional layer of defense. Regular security audits focusing on memory safety in C or C++ based network services are essential to prevent similar vulnerabilities from being introduced in future updates.