CVE-2026-28618 in Android
Summary
by MITRE • 09/08/2026
In dec_frm_prepare of oapv.c, there is a possible OOB write due to a heap buffer overflow. This could lead to remote code execution with no additional execution privileges needed. User interaction is not needed for exploitation.
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Analysis
by VulDB Data Team • 09/08/2026
The vulnerability identified in the dec_frm_prepare function within the oapv.c source file represents a critical security flaw characterized by an out-of-bounds write resulting from a heap buffer overflow. This type of memory corruption issue arises when the application writes data beyond the allocated boundaries of a heap-allocated buffer, typically due to insufficient validation of input parameters or incorrect calculation of buffer sizes during frame preparation processes. The root cause lies in the failure to properly enforce bounds checking before copying or manipulating data structures that are critical for video decoding operations. When an attacker supplies crafted input with malformed dimensions or excessive payload size, the application fails to detect the discrepancy and proceeds to write past the end of the allocated memory region. This behavior is a classic example of CWE-122, which denotes heap-based buffer overflow, where the integrity of adjacent memory structures on the heap is compromised.
The operational impact of this vulnerability is severe because it allows for remote code execution without requiring any additional privileges from the victim user or necessitating direct interaction with the application interface. Since video processing libraries are often integrated into network-facing services such as media servers, streaming platforms, or communication applications, an attacker can exploit this flaw by sending a specially crafted malicious file or stream over the network. The lack of required user interaction significantly lowers the barrier to entry for exploitation, enabling fully automated attacks that do not rely on social engineering tactics like phishing links or clicking specific UI elements. Once the heap buffer overflow is triggered, the attacker gains control over the program flow by corrupting critical memory structures such as function pointers, object headers, or exception handlers located adjacent to the overwritten buffer.
From a threat modeling perspective, this vulnerability aligns with ATT&CK technique T1203, which covers Exploitation for Client Execution, specifically in contexts where client-side applications process untrusted media files. The ability to achieve remote code execution through memory corruption techniques places this flaw in the highest severity category of risk assessments. Attackers can leverage standard exploitation frameworks such as Metasploit or custom shellcode delivery mechanisms to execute arbitrary commands on the target system with the privileges of the vulnerable application process. This could lead to complete compromise of the host, including data exfiltration, installation of persistent backdoors, and lateral movement within a network environment if the compromised machine serves as an entry point for further attacks.
Mitigation strategies must focus on both immediate remediation and long-term defensive engineering practices. The primary fix involves rigorous input validation within the dec_frm_prepare function to ensure that all size parameters are checked against actual buffer capacities before any memory copy operations occur. Developers should implement strict bounds checking logic that rejects inputs exceeding predefined limits or triggers safe error handling routines instead of proceeding with unsafe writes. Additionally, adopting modern programming practices such as using safer string and memory manipulation functions provided by standard libraries can reduce the likelihood of similar overflow conditions in other parts of the codebase. On a broader architectural level, deploying runtime protection mechanisms like Address Space Layout Randomization (ASLR), Data Execution Prevention (DEP), and stack canaries can mitigate the success rate of exploitation attempts even if the underlying vulnerability remains present until patched. Regular security audits focusing on memory management routines in media processing components are essential to prevent recurrence of such high-severity flaws.