CVE-2026-97824 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 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 structure. In the context of DNS servers, which are fundamental components of internet routing and resolution services, such flaws can have severe implications for system integrity and confidentiality. The root cause typically stems from insufficient validation of input parameters or improper handling of packet structures during parsing operations. When a malicious actor sends specially crafted DNS queries to the vulnerable server, the application may read memory contents beyond the allocated buffer limits. This behavior is directly aligned with Common Weakness Enumeration (CWE) identifiers such as CWE-125 Out-of-bounds Read and potentially CWE-20 Improper Input Validation if the root cause involves inadequate sanitization of incoming network data.
From an operational perspective, this vulnerability allows for information disclosure rather than immediate remote code execution or denial of service in its primary manifestation. An authorized attacker, meaning someone with legitimate access to the DNS server interface or network segment where the server resides, can exploit this flaw to leak sensitive memory contents. These leaked bytes may contain stack data, heap metadata, internal application states, or even cryptographic keys and user credentials if they reside within the accessible memory range at the time of exploitation. The ability to read arbitrary memory locations undermines the confidentiality guarantees provided by the operating system's memory protection mechanisms. This aligns with MITRE ATT&CK techniques related to Credential Access via Unsecured Credentials (T1552) or System Information Discovery, as the attacker can gather intelligence about the underlying infrastructure and potentially pivot to more severe attacks such as remote code execution through information leak-assisted exploitation strategies like return-oriented programming.
The impact of this vulnerability extends beyond immediate data leakage. DNS servers are high-value targets due to their central role in network operations. Successful exploitation could lead to a partial or complete compromise of the server's security posture, enabling further lateral movement within the enterprise network. Attackers might use the disclosed information to bypass authentication mechanisms, decrypt secure communications, or identify other vulnerable systems by analyzing internal structures and configurations exposed through memory leaks. Furthermore, repeated exploitation attempts can cause instability in the DNS service, leading to intermittent failures that degrade overall network performance and availability, although the primary classification here is confidentiality breach rather than integrity or availability compromise.
Mitigation strategies for this vulnerability require a multi-layered approach focusing on both immediate remediation and long-term architectural improvements. The most effective solution is to apply vendor-provided security patches that address the specific memory handling errors within the DNS server software. Organizations should prioritize patching based on risk assessments, considering factors such as exposure level and criticality of services hosted by the affected systems. In addition to patching, implementing network segmentation can limit an attacker's ability to reach the vulnerable service even if they have authorized access elsewhere in the network. Deploying intrusion detection or prevention systems with signatures for known DNS exploitation patterns may also help mitigate active attacks while patches are being applied. From a development perspective, adopting secure coding practices that emphasize bounds checking and using memory-safe programming languages can prevent similar vulnerabilities from arising in future software versions. Regular security audits and static code analysis tools should be integrated into the development lifecycle to detect such flaws early before deployment.