CVE-2026-97825 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 memory read operation. This type of error typically arises when the software fails to properly validate input data or array indices before accessing memory locations. In the context of DNS servers, which are fundamental components of internet connectivity responsible for translating domain names into IP addresses, such a flaw can be triggered by processing specially crafted DNS queries. The core technical issue lies in the server's inability to correctly bound-check its access to internal buffers or data structures during query parsing and response generation. When an attacker sends a maliciously constructed packet that exploits this boundary condition, the application reads memory contents beyond the intended allocation limits. This behavior is classified under Common Weakness Enumeration as CWE-125, which defines out-of-bounds read vulnerabilities where software accesses memory inappropriately without proper bounds checking.
The operational impact of this vulnerability centers on information disclosure rather than immediate code execution or denial of service, although secondary effects may occur depending on the specific implementation details and what data resides adjacent to the accessed buffer. Because DNS servers often handle sensitive internal network topology information, cached records, and potentially authentication tokens within their memory space, an unauthorized read can expose these assets to external observers. An authorized attacker, possessing valid credentials or access privileges that allow interaction with the DNS service, can leverage this flaw to extract arbitrary data from the server's process memory. This disclosure compromises confidentiality by revealing internal network configurations, hostnames, IP addresses of critical infrastructure, and potentially cryptographic keys if they are stored in accessible memory regions. The ability to read sensitive information over a network significantly elevates the risk profile, as it allows for reconnaissance activities that can facilitate further attacks such as lateral movement or targeted phishing campaigns against high-value targets within the organization.
From an offensive security perspective, this vulnerability aligns with several tactics and techniques defined in the MITRE ATT&CK framework. It primarily supports the Reconnaissance phase, specifically technique T1046 which involves Network Service Discovery, where attackers gather information about services running on network hosts to identify potential entry points or weaknesses. Additionally, if the disclosed memory contents include credentials or session tokens, it may also relate to Credential Access techniques such as T1539 Steal Web Session Cookie or more broadly data exfiltration methods that rely on reading sensitive process memory. The exploitation of this flaw does not require complex privilege escalation since the attacker is already authorized, making it a potent tool for insiders or compromised accounts seeking to expand their footprint within the network environment without triggering immediate alarms associated with brute-force attacks or obvious system crashes.
Mitigation strategies must address both the technical root cause and the broader operational context of DNS server management. Immediately, administrators should apply vendor-provided patches that correct the memory access validation logic in the DNS software. If patching is not immediately feasible, network segmentation can help limit exposure by restricting which hosts are allowed to query the vulnerable DNS servers, thereby reducing the attack surface available to potential attackers. Implementing strict input validation and sanitization protocols for all incoming DNS queries is essential to prevent malformed packets from triggering the out-of-bounds condition. Furthermore, deploying intrusion detection systems configured with signatures that detect anomalous DNS traffic patterns associated with memory exploitation attempts can provide an additional layer of defense. Regular security audits and code reviews focusing on C or C++ based network services are recommended to identify similar boundary checking errors before they reach production environments. Finally, enforcing the principle of least privilege ensures that even if such a vulnerability is exploited, the scope of data accessible by the attacker remains minimized through robust access control policies governing DNS server interactions.