CVE-2026-97828 in Windows
Summary
by MITRE • 10/14/2026
Buffer over-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 buffer over-read condition within the Domain Name System (DNS) server software, representing a significant security risk that enables unauthorized data disclosure. This flaw arises when the application reads beyond the boundaries of allocated memory buffers without proper validation checks on input length or array indices. In the context of DNS operations, where servers process complex query structures and response payloads, such an error typically occurs during the parsing or serialization of packet data. When a specially crafted request is received, the server may access memory locations adjacent to the intended buffer, inadvertently exposing sensitive internal state information, stack contents, heap metadata, or other confidential data stored in those neighboring memory regions.
From a technical perspective, this issue aligns with Common Weakness Enumeration (CWE) category CWE-126, which covers Buffer Over-read vulnerabilities. The root cause often involves insufficient bounds checking when handling variable-length fields within DNS messages, such as domain names or resource records. If the server fails to verify that the requested read operation does not exceed the allocated buffer size, it will retrieve arbitrary memory contents and potentially include them in the response sent back to the client. This behavior deviates from secure coding practices mandated by standards like OWASP and MITRE ATT&CK technique T1059, specifically regarding command-line or script interpretation if exploited via automated tools, though more directly it relates to information leakage vectors where attackers probe for sensitive data exposure through malformed inputs.
The operational impact of this vulnerability is primarily centered on confidentiality loss rather than integrity or availability in its initial exploitation phase. An authorized attacker, possessing valid credentials or network access privileges that allow interaction with the DNS service, can leverage this flaw to exfiltrate internal server information. This disclosed data may include cryptographic keys, session tokens, private IP addresses of backend infrastructure, or other proprietary details critical for further reconnaissance and lateral movement within a corporate network. Such information leakage facilitates advanced persistent threats by providing attackers with contextual intelligence needed to craft more sophisticated attacks against related systems.
Mitigation strategies must focus on both immediate remediation and long-term defensive posture improvements. Immediate actions include applying vendor-provided patches that address the specific buffer handling logic, ensuring all memory access operations are strictly bounded by validated input lengths. Developers should implement rigorous static analysis tools during code review to detect potential over-read conditions before deployment. Additionally, deploying network-level protections such as intrusion detection systems configured to identify anomalous DNS query patterns can help mitigate exploitation attempts in real-time. Regular security audits and adherence to secure development lifecycles emphasizing memory safety principles are essential for preventing similar vulnerabilities from recurring in future software versions.