CVE-2026-96232 in .NET
Summary
by MITRE • 10/14/2026
Out-of-bounds read in .NET allows an unauthorized 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 out-of-bounds read flaw within the Microsoft .NET framework, specifically impacting components that process external data inputs without adequate boundary validation. This type of memory safety issue arises when the application attempts to access memory locations beyond the allocated buffer limits during parsing or serialization operations. In the context of managed code like .NET, such errors often stem from unsafe blocks, interop calls with unmanaged libraries, or complex deserialization logic where input length is not strictly verified against expected array sizes before reading. The core technical flaw lies in the failure to enforce strict bounds checking on data structures that are populated by network-transmitted payloads. When an attacker crafts a maliciously sized request, the runtime may read past the end of a valid memory buffer, potentially exposing adjacent memory contents that were not intended for disclosure. This behavior violates fundamental principles of secure coding and represents a significant deviation from expected application security controls.
From an operational perspective, this vulnerability enables unauthorized information disclosure over a network, allowing remote attackers to extract sensitive data such as internal state variables, cryptographic keys, or other confidential information stored in adjacent memory regions. The impact is particularly severe because it can be exploited remotely without requiring authentication if the affected service endpoint is publicly accessible. Attackers can leverage automated tools to send multiple requests with varying payload sizes and analyze response times or error patterns to reconstruct sensitive data byte by byte. This capability effectively bypasses traditional access control mechanisms, turning a standard network service into an information leak channel. The severity of this issue is compounded by the widespread adoption of .NET in enterprise environments, where such services often handle critical business logic and user data.
This vulnerability aligns with Common Weakness Enumeration category CWE-125, which defines out-of-bounds read as accessing memory beyond the intended boundary of a buffer. It also maps to MITRE ATT&CK technique T1005, specifically Data from Local System Retrieval, where adversaries collect sensitive data directly from compromised systems through local access or exploitation of software flaws. The lack of proper input validation and bounds checking is characteristic of CWE-20, Improper Input Validation, which serves as the root cause for many memory corruption vulnerabilities in modern applications. Addressing this issue requires a comprehensive review of all code paths that handle external data inputs, particularly those involving serialization, deserialization, or direct memory manipulation via unsafe contexts.
Mitigation strategies must focus on implementing rigorous input validation and enforcing strict boundary checks before any read operations are performed on buffers derived from network requests. Developers should utilize safe APIs provided by the .NET framework that automatically manage bounds checking rather than relying on manual pointer arithmetic or unsafe code blocks where possible. If unsafe code is necessary, it must be subjected to additional scrutiny with static analysis tools and dynamic testing to ensure all access patterns remain within allocated limits. Additionally, deploying runtime protection mechanisms such as Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR) can mitigate the exploitation potential by making memory layout unpredictable and preventing code execution from data regions. Updating to the latest patched version of .NET is essential, as Microsoft typically releases security updates that include specific fixes for known out-of-bounds vulnerabilities in their runtime libraries.