CVE-2026-58699 in Android
Summary
by MITRE • 09/15/2026
In Vp9DecEndOfStream of vp9hwd_output.cc, there is a possible out-of-bounds read due to an incorrect bounds check. This could lead to local escalation of privilege 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 Vp9DecEndOfStream function within vp9hwd_output.cc represents a critical memory safety issue stemming from an insufficient bounds check during video stream decoding operations. This flaw allows for an out-of-bounds read, which occurs when the application accesses memory locations beyond the intended buffer boundaries due to incorrect validation of array indices or pointer arithmetic. In the context of VP9 hardware acceleration and decoding pipelines, such errors are particularly dangerous because they can expose sensitive kernel-mode data structures or user-space memory contents that were not meant to be accessible by the current execution context. The root cause lies in a logical error where the condition verifying whether an index is within valid limits fails to account for edge cases or specific input configurations, leading to unauthorized memory access.
From a technical perspective, this out-of-bounds read aligns with CWE-125, which describes Out-of-Bounds Read vulnerabilities. These types of flaws are often precursors to more severe exploits because they can be leveraged to leak information about the system's memory layout or internal state. In many modern operating systems and browser environments, reading arbitrary memory locations can facilitate further exploitation steps such as bypassing security mitigations like Address Space Layout Randomization (ASLR) by leaking pointer addresses. Although the immediate impact described is an escalation of privilege, this typically implies that the attacker has already achieved some level of code execution or sandbox escape, and the out-of-bounds read serves to gather necessary information for a full system compromise. The vulnerability does not require user interaction, meaning it can potentially be triggered automatically through maliciously crafted video content embedded in web pages or processed by local applications, significantly increasing its attack surface.
The operational impact of this vulnerability is severe due to the potential for local privilege escalation. An attacker who successfully exploits this flaw could gain higher-level permissions on the affected system, effectively taking control over user accounts or even achieving root access depending on the context in which the vulnerable component runs. This undermines the fundamental security principle of least privilege and can lead to complete system compromise. The absence of a need for additional execution privileges suggests that the vulnerability might be reachable through standard media processing routines without requiring prior code injection, making it attractive for drive-by download attacks or automated exploitation campaigns targeting systems with video playback capabilities enabled.
Mitigation strategies must focus on both immediate patching and long-term architectural improvements. Developers should immediately apply vendor-provided patches that correct the bounds checking logic in vp9hwd_output.cc to ensure all memory accesses are validated against actual buffer sizes before execution. Beyond fixing this specific instance, it is crucial to implement robust input validation mechanisms across the entire media decoding pipeline. Utilizing static analysis tools and fuzzing techniques can help identify similar logical errors in other parts of the codebase. Furthermore, enabling compiler-based security features such as stack protectors and address sanitizers during development builds can aid in detecting these issues early. From a defensive standpoint, users should ensure their systems are updated with the latest security patches for browsers and media players that utilize this library. Network segmentation and application whitelisting can also reduce the risk of exploitation by limiting which processes have access to sensitive resources or network interfaces.
This vulnerability is associated with ATT&CK technique T1059, specifically Command Line Interface Sub-techniques if it leads to further command execution, but more accurately reflects aspects of information disclosure and privilege escalation pathways often seen in browser-based exploits. It underscores the importance of rigorous memory safety practices in low-level code handling multimedia data. Security teams should prioritize reviewing similar hardware-accelerated decoding components for analogous flaws, as these areas are frequently targeted due to their complexity and performance-critical nature which sometimes leads to simplified or incorrect security checks. Regular audits of bounds checking logic in high-throughput media processing functions are essential to prevent such vulnerabilities from being exploited in the wild.