CVE-2026-58710 in Android
Summary
by MITRE • 09/15/2026
In DecodeFilmGrainParams of film_grain_dec.cc, there is a possible out-of-bounds write due to a missing bounds check. 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 • 09/15/2026
The vulnerability identified in the DecodeFilmGrainParams function within film_grain_dec.cc represents a critical memory safety issue characterized by an out-of-bounds write resulting from insufficient input validation. This flaw occurs when the software fails to verify that data indices or buffer sizes remain within the allocated limits of the target array or memory structure before performing write operations. In the context of video decoding, particularly for film grain parameters which are often embedded in compressed bitstreams such as those used in AV1 or VP9 codecs, this lack of bounds checking allows an attacker to manipulate specific fields in the input stream to cause writes beyond the intended boundaries of allocated memory buffers. The absence of these checks means that maliciously crafted data can overwrite adjacent memory locations, potentially corrupting critical program state structures or overwriting function pointers and return addresses on the stack or heap.
From a technical perspective, this vulnerability aligns with Common Weakness Enumeration category CWE-787, which denotes out-of-bounds write vulnerabilities where software writes data past the end of a buffer but before the beginning of another buffer in memory. The operational impact is severe because it enables remote code execution without requiring any additional privileges from the victim user or necessitating direct interaction with the application interface beyond viewing malicious content. An attacker can construct a specially crafted video file containing malformed film grain parameters that, when processed by the vulnerable decoder component, trigger the out-of-bounds write condition. This allows for arbitrary memory modification which is a primary prerequisite for achieving code execution on the target system. The exploitability of this flaw is high due to its remote nature and low barrier to entry, as it does not require user interaction such as clicking links or opening specific dialogs beyond simply loading the malicious media file into an affected application that utilizes this decoder library.
In terms of threat modeling and attack vectors, this vulnerability maps directly to MITRE ATT&CK technique T1203, which covers Exploitation for Client Execution. The attacker leverages a trusted application component to execute arbitrary code on the victim's machine by exploiting a flaw in how that component processes untrusted input data. Since video processing is often performed automatically or with minimal user intervention during playback or background decoding tasks, the window of opportunity for exploitation is broad and difficult for users to monitor actively. The lack of required privileges further exacerbates the risk, as even sandboxed environments may be compromised if the memory corruption allows escaping isolation boundaries through heap spraying techniques or other advanced exploitation methods that leverage the precise control over memory layout provided by out-of-bounds writes.
Mitigation strategies must focus on rigorous input validation and defensive programming practices within the decoding logic. Developers should implement strict bounds checking for all array accesses and buffer operations, ensuring that indices are validated against allocated sizes before any write operation occurs. Utilizing static analysis tools configured to detect memory safety violations can help identify such flaws during the development phase. Furthermore, adopting safer coding standards or using language features that provide automatic bounds checking where applicable can reduce the likelihood of similar vulnerabilities emerging in future code revisions. For immediate remediation, applying vendor-provided patches is essential as they typically include specific fixes for these boundary checks within the DecodeFilmGrainParams function and related decoding routines to prevent out-of-bounds memory access when processing potentially malicious video streams.