CVE-2026-59007 in Android
Summary
by MITRE • 11/02/2026
In decode_packed_entry_number of codebook.c, there is a possible out-of-bounds read due to a logic error in the code. This could lead to remote information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.
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Analysis
by VulDB Data Team • 11/02/2026
The vulnerability identified within the decode_packed_entry_number function located in codebook.c represents a critical logical flaw that results in an out-of-bounds read condition. This specific type of memory safety issue arises when the application attempts to access data at a memory address that lies outside the intended buffer boundaries, typically due to incorrect calculations regarding array indices or pointer arithmetic during the decoding process. In this context, the logic error likely stems from insufficient validation of input parameters before they are used to calculate offsets for reading packed entry numbers. When an attacker supplies crafted input that triggers this miscalculation, the program reads memory locations beyond the allocated buffer space, potentially exposing sensitive data stored in adjacent memory regions such as stack variables, heap metadata, or other process information.
From a technical perspective, out-of-bounds read vulnerabilities are classified under CWE-125, which denotes Out-of-Bounds Read. This weakness is particularly dangerous because it allows an attacker to leak internal state information without necessarily crashing the application immediately, although crashes can occur if the accessed memory is unmapped or protected by operating system security mechanisms like Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR). The absence of proper bounds checking means that the software fails to verify whether the calculated index remains within the valid range of the buffer. This lack of validation creates a direct pathway for information disclosure, where an adversary can extract cryptographic keys, session tokens, or other confidential data embedded in memory adjacent to the vulnerable buffer.
The operational impact of this vulnerability is severe due to its potential for remote exploitation without requiring user interaction or elevated privileges. The description indicates that no additional execution privileges are needed, meaning any authenticated or unauthenticated user depending on the service's access controls can trigger the flaw. Furthermore, the fact that user interaction is not required significantly lowers the barrier to entry for attackers, allowing for automated scanning and exploitation at scale. This aligns with MITRE ATT&CK technique T1083, which covers File and Directory Discovery, or more broadly T1567 Exfiltration Over Web Services if the leaked data is transmitted out of band. The ability to perform remote information disclosure enables attackers to gather intelligence about the target environment, facilitating further stages of an attack chain such as privilege escalation or lateral movement within a networked infrastructure.
Mitigation strategies must focus on rigorous input validation and memory safety practices. Developers should implement strict bounds checking before any array access or pointer dereference operation is performed in the decode_packed_entry_number function. This involves verifying that all indices derived from user-controlled inputs are strictly less than the size of the target buffer and greater than or equal to zero. Additionally, employing static analysis tools configured to detect CWE-125 patterns can help identify similar logical errors across the codebase before deployment. For immediate remediation, patching the software with a version that includes these validation checks is essential. In environments where patching may not be immediately feasible, deploying web application firewalls or intrusion detection systems capable of identifying anomalous memory access patterns or malformed input structures can provide an additional layer of defense against exploitation attempts.