CVE-2026-58988 in Android
Summary
by MITRE • 11/02/2026
In isValid of ShimConverter.cpp, there is a possible out of bounds read due to a missing bounds check. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.
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Analysis
by VulDB Data Team • 11/03/2026
The vulnerability identified in the ShimConverter component specifically within its validation logic presents a critical security risk characterized by an improper access control mechanism that results in out-of-bounds memory reads. This flaw stems from a missing bounds check during the processing of input data, which allows the application to read beyond the allocated boundaries of a buffer or array structure. In software development, such errors typically occur when index values are not validated against the actual size of the target data structure before being used for memory access operations. The absence of this validation step means that maliciously crafted inputs can trigger reads from adjacent memory locations that were not intended to be accessed by the application logic. This type of defect is a classic example of CWE-125, which categorizes out-of-bounds read vulnerabilities where software accesses memory beyond the end or before the beginning of an allocated buffer.
From an operational perspective, this vulnerability facilitates local information disclosure without requiring any additional execution privileges for the attacker. The lack of privilege escalation requirements significantly lowers the barrier to exploitation, allowing a standard user account with limited permissions to potentially extract sensitive data from the process memory space. Furthermore, the fact that user interaction is not required for exploitation makes this flaw particularly dangerous in automated environments or scenarios where untrusted input can be injected programmatically. An attacker could leverage this condition to leak internal application states, cryptographic keys, stack cookies, or other confidential information stored in adjacent memory regions. This aligns with ATT&CK technique T1005, which describes data from local system extraction, as the primary goal of exploiting such a vulnerability is often to gather intelligence that can be used for further attacks within the network perimeter.
The implications of this out-of-bounds read extend beyond simple information leakage. While immediate code execution may not be directly possible through an out-of-bounds read alone compared to buffer overflows, the disclosed memory contents can provide critical context for subsequent exploitation phases. For instance, leaked pointers or stack canaries could aid in bypassing security mitigations such as Address Space Layout Randomization (ASLR) and Stack Canaries. This transforms a simple information disclosure flaw into a potential precursor for more severe compromise scenarios involving remote code execution if combined with other vulnerabilities or specific memory corruption techniques. The vulnerability highlights the importance of rigorous input validation and defensive programming practices, particularly in components that handle data conversion or transformation where edge cases might be overlooked during initial development cycles.
To mitigate this risk, developers must implement strict bounds checking before any array indexing or pointer arithmetic operations are performed on user-controlled inputs. This involves verifying that all indices fall within the valid range of zero to the size of the buffer minus one. Additionally, adopting static analysis tools and fuzzing techniques during the software development lifecycle can help identify such logic errors early in the testing phase. Enabling compiler-based security features like stack protectors and using memory-safe programming languages or libraries where possible further reduces the attack surface. Regular code reviews focusing on boundary conditions and input validation are essential to prevent similar defects from being introduced into critical system components, ensuring that applications remain resilient against local information disclosure attacks.