CVE-2026-20586 in MT2718
Summary
by MITRE • 10/05/2026
In vdec, there is a possible out of bounds write due to a missing bounds check. This could lead to remote escalation of privilege with no additional execution privileges needed. User interaction is needed for exploitation. Patch ID: ALPS11383899; Issue ID: MSV-9614.
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Analysis
by VulDB Data Team • 10/05/2026
The vulnerability identified under issue identifier MSV-9614 and addressed by patch ALPS11383899 resides within the vdec component, which is typically responsible for video decoding operations in embedded systems or mobile platforms. This specific flaw manifests as an out-of-bounds write condition resulting from a missing bounds check during memory allocation or data processing routines. In technical terms, when the decoder processes input streams that contain malformed or specifically crafted payloads, it fails to validate whether the calculated destination address falls within the allocated buffer limits. Consequently, the application writes data beyond the boundaries of the intended memory region, overwriting adjacent memory structures. This type of error is a classic example of CWE-787, which classifies out-of-bounds write vulnerabilities that allow attackers to corrupt critical system state or execute arbitrary code by manipulating heap metadata or function pointers located in nearby memory locations.
The operational impact of this vulnerability is severe due to its potential for remote escalation of privilege. Although the description notes that user interaction is required for exploitation, this typically implies that a victim must open a maliciously crafted video file or stream within an application utilizing the vulnerable vdec component. Once triggered, the out-of-bounds write can lead to arbitrary code execution with elevated privileges, effectively allowing an attacker to bypass standard security restrictions and gain control over the underlying operating system. This aligns with ATT&CK technique T1068, which covers exploitation for privilege escalation, as well as T1203, which involves software application exploit techniques where attackers leverage flaws in applications like media players or browsers that handle untrusted input. The requirement for user interaction does not diminish the severity but rather defines the attack vector as social engineering dependent, requiring a specific trigger event such as viewing a malicious file.
Mitigation strategies primarily rely on the deployment of the provided patch ALPS11383899, which introduces rigorous boundary validation checks before any memory write operations occur within the video decoding pipeline. Developers and system integrators must ensure that this update is applied to all affected devices or software versions immediately. Beyond applying patches, defensive measures should include implementing strict input sanitization for media files processed by the decoder, although the root cause lies in the internal logic of vdec rather than external filtering. Additionally, enabling memory protection mechanisms such as Address Space Layout Randomization (ASLR) and Data Execution Prevention (DEP) can mitigate the risk of successful code execution even if an out-of-bounds write occurs, as these technologies make it significantly harder for attackers to predict target addresses or execute injected shellcode. Regular security audits focusing on buffer management in multimedia components are also recommended to prevent similar vulnerabilities from being introduced during future development cycles.