CVE-2026-50039 in libIEC61850
Summary
by MITRE • 07/24/2026
The affected product is vulnerable to a stack-based buffer overflow, which may allow an attacker to cause a memory corruption via a Read Request.
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Analysis
by VulDB Data Team • 07/24/2026
A stack-based buffer overflow vulnerability represents a critical security flaw that occurs when a program writes more data to a fixed-length buffer located on the stack than it can accommodate. This particular vulnerability manifests within an affected product where an attacker can trigger memory corruption through a Read Request operation, indicating that the system fails to properly validate input lengths before processing read operations. The flaw stems from inadequate bounds checking mechanisms that permit excessive data to be copied into stack-allocated memory regions, ultimately leading to overwriting adjacent memory locations including return addresses, saved registers, and other critical program state information.
The technical exploitation of this vulnerability follows established patterns documented in common weakness enumeration cwe-121 and cwe-787 which classify it as a stack-based buffer overflow. When an attacker crafts malicious input data for a read request, the insufficient validation allows them to overwrite the stack frame of the executing function. This memory corruption can result in arbitrary code execution, system crashes, or privilege escalation depending on the specific implementation and execution context. The attack vector specifically targets read operations which suggests the vulnerability exists in input handling routines that process external data streams, file reads, or network packets without proper size verification before copying into local stack buffers.
The operational impact of this vulnerability extends beyond simple denial of service scenarios as it can enable complete system compromise when successfully exploited. Memory corruption through stack overflows provides attackers with opportunities to manipulate program execution flow by overwriting return addresses and function pointers, potentially allowing them to redirect code execution to malicious payloads. This type of vulnerability aligns with attack techniques described in the attack tree framework where adversaries can leverage memory corruption primitives to achieve persistent access or escalate privileges within affected systems. The severity is amplified when considering that read requests often involve untrusted data sources such as user input, network traffic, or file contents which makes exploitation more likely and accessible.
Mitigation strategies should focus on implementing robust input validation and bounds checking mechanisms throughout the software development lifecycle. Developers must employ secure coding practices including buffer size verification, use of safe string handling functions, and stack canary implementations to detect potential overflows before they can be exploited. Memory protection features such as address space layout randomization aslr, data execution prevention dep, and stack smashing protection can provide additional defense layers against exploitation attempts. Regular security code reviews and static analysis tools should be implemented to identify similar buffer overflow patterns across the codebase, while dynamic analysis techniques including fuzzing and memory debugging can help detect potential exploitation scenarios before they reach production environments. The vulnerability's classification under cwe-121 and cwe-787 emphasizes the need for comprehensive defensive measures that address both the immediate stack corruption issue and broader software security principles to prevent similar flaws from occurring in related components.