CVE-2026-97829 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 manifesting as an out-of-bounds read condition. This type of memory corruption error occurs when the software attempts to access data at a memory location that is outside the boundaries of the intended buffer or array. In the context of DNS servers, which are fundamental components of internet infrastructure responsible for translating domain names into IP addresses, such flaws can have severe implications for system stability and information confidentiality. The specific nature of this vulnerability allows an attacker who has already gained authorized access to exploit the memory mismanagement issue, thereby bypassing standard security controls that rely on authentication mechanisms.
From a technical perspective, out-of-bounds reads typically arise due to insufficient validation of input parameters or incorrect calculations regarding buffer sizes during packet processing. When a DNS server processes incoming queries, it must parse various fields within the protocol message structure. If the code fails to verify that these fields do not exceed expected limits before reading from memory, it may retrieve data adjacent to the intended target. This adjacent memory might contain sensitive information such as internal network configurations, cached records of other users, cryptographic keys, or even parts of the operating system's kernel if the server is running with elevated privileges. The exploitation of this flaw does not require arbitrary code execution but rather focuses on information disclosure, which can serve as a precursor to more severe attacks by providing attackers with valuable intelligence about the target environment.
The operational impact of this vulnerability extends beyond simple data leakage. By disclosing internal network details or sensitive configuration data, an attacker gains significant insight into the architecture and security posture of the organization hosting the DNS server. This information can be leveraged for further reconnaissance activities, allowing the adversary to identify other vulnerable systems, map out trust relationships between services, or plan targeted attacks against more critical assets within the network perimeter. Furthermore, depending on the specific implementation details, repeated exploitation could potentially lead to denial-of-service conditions if the memory access triggers a segmentation fault or crashes the DNS service process, thereby disrupting name resolution for legitimate users and impacting business continuity.
In terms of industry standard classifications, this vulnerability aligns with Common Weakness Enumeration (CWE) identifiers such as CWE-125 Out-of-bounds Read, which describes reading data beyond the end of a buffer without causing an exception or crash but potentially leaking sensitive information. Additionally, from the perspective of the MITRE ATT&CK framework, this activity falls under techniques related to Collection and Exfiltration over C2 channels, specifically where unauthorized access is used to gather system information for subsequent exploitation phases. The fact that it requires authorized access places it within scenarios involving compromised credentials or insider threats, highlighting the importance of robust identity and access management practices alongside technical mitigations.
To mitigate this risk, organizations must ensure that their DNS server software is updated with the latest patches provided by the vendor, which typically include rigorous input validation checks and bounds checking routines to prevent memory accesses outside allocated regions. Implementing defense-in-depth strategies is crucial; this includes restricting network access to the DNS servers so that only trusted clients can send queries, thereby reducing the attack surface for authorized attackers who might have compromised legitimate accounts. Network segmentation should be employed to isolate critical infrastructure components from general user networks, limiting the lateral movement capabilities of an attacker even if they gain initial foothold through other means. Regular security audits and code reviews focusing on memory management practices in network services can also help identify and remediate similar vulnerabilities before they are exploited in production environments.