CVE-2026-97841 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 safety 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 connectivity and network resolution services, 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 improper memory handling routine, leading to a disclosure of sensitive internal data that was not intended to be exposed to external entities or lower-privilege users.
From a technical perspective, out-of-bounds reads are often categorized under CWE-125, which defines the act of reading past the end of a buffer. This flaw typically arises due to insufficient validation of input parameters or incorrect calculation of array indices during packet parsing or response generation processes within the DNS server software. When an authorized attacker interacts with the vulnerable component by sending specially crafted requests that trigger this erroneous memory access pattern, the application may read adjacent memory contents into its processing pipeline. These adjacent memory locations often contain sensitive information such as internal network configurations, cached query results, authentication tokens, or other proprietary data structures used by the server for normal operations. The attacker can then reconstruct and extract this leaked information through careful analysis of the response packets returned by the compromised service.
The operational impact of this vulnerability is significant because it undermines the confidentiality guarantees provided by the DNS infrastructure. Although the requirement for authorization limits the pool of potential attackers, any compromise of authorized credentials or insider threats pose a serious risk. The disclosure of internal network information can facilitate further reconnaissance activities, allowing an attacker to map out the internal topology, identify critical assets, and plan more targeted attacks against other systems within the organization. Furthermore, if the leaked data includes cryptographic keys or session tokens, it could lead to complete compromise of secure communications and unauthorized access to protected resources. This aligns with the MITRE ATT&CK technique T1005, which covers Data from Local System Retrieval, as well as potential alignment with T1499 for Endpoint Denial of Service if the memory corruption leads to crashes or instability in high-volume environments.
To mitigate this risk, organizations must prioritize immediate patching of the DNS server software to versions that include fixes for out-of-bounds read vulnerabilities. It is essential to verify vendor advisories and apply security updates promptly after thorough testing in non-production environments to ensure compatibility with existing infrastructure components. Additionally, implementing strict input validation mechanisms at the application layer can help prevent malformed packets from triggering these memory errors. Network segmentation strategies should also be reviewed to limit the exposure of DNS servers to only necessary authorized users and systems. Regular vulnerability assessments and penetration testing focused on network services will aid in identifying similar weaknesses before they can be exploited by malicious actors seeking to gain unauthorized access or disclose sensitive information.