CVE-2026-28666 in Android
Summary
by MITRE • 09/08/2026
In multiple functions of LocalImageResolver.java, there is a possible Remote Persistent Denial of Service due to a DNG image rendering check bypass. This could lead to remote 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 • 09/08/2026
The vulnerability identified in the LocalImageResolver component represents a critical security flaw within the Android operating system's media handling subsystem, specifically affecting how device-local images are resolved and processed before being presented to applications or system services. This issue stems from an insufficient validation mechanism during the rendering phase of Digital Negative (DNG) image files, which are raw photo formats commonly generated by high-end digital cameras and smartphones. The core technical flaw involves a bypass in the logic that checks whether an image can be safely rendered for display purposes. Instead of performing comprehensive integrity checks on all metadata and structural elements within the DNG file before initiating the rendering pipeline, the resolver relies on incomplete heuristics or skips specific validation steps under certain conditions. This oversight allows malformed or specially crafted DNG files to bypass standard safety barriers that would normally prevent problematic data from reaching lower-level graphics libraries such as Skia or hardware-accelerated renderers.
From a technical perspective, this flaw falls squarely within the category of Improper Input Validation and Insufficient Verification of Data Authenticity, aligning with CWE-20 and CWE-367 respectively in the Common Weakness Enumeration framework. The absence of rigorous boundary checking on image dimensions, metadata size, or embedded color profiles permits an attacker to inject data that causes memory corruption, infinite loops, or resource exhaustion within the rendering engine. Because DNG files are complex containers with multiple chunks and streams, manipulating these structures can lead to unpredictable behavior in the native code layers responsible for decoding and displaying images. The vulnerability is particularly dangerous because it does not require user interaction; an attacker who gains access to a device's storage or network share where such files might be automatically ingested by media scanners or gallery applications can trigger the exploit passively. This characteristic significantly lowers the barrier to entry for exploitation, allowing for automated attacks that do not depend on social engineering tactics like tricking a user into opening a specific file.
The operational impact of this vulnerability is severe, primarily manifesting as a Remote Persistent Denial of Service against critical system components responsible for image processing. When triggered, the flaw can cause persistent crashes in services such as MediaProvider or SystemUI, leading to device instability, reboot loops, or complete unresponsiveness until the malicious file is removed and caches are cleared. However, the implications extend far beyond simple denial of service. In many Android subsystems, memory corruption issues arising from improper input validation often serve as a precursor to more severe attacks, including arbitrary code execution. Although the primary description highlights privilege escalation potential, this typically implies that an attacker could leverage the instability or state confusion caused by the malformed DNG file to exploit secondary vulnerabilities in adjacent components, thereby achieving remote code execution with elevated privileges without needing any additional execution permissions initially granted to the attacking application. This aligns with ATT&CK techniques related to Initial Access via Trusted Software and Defense Evasion through Obfuscated Files, as the attack vector relies on legitimate system processes being manipulated by maliciously crafted data rather than direct exploitation of a network service port.
Mitigation strategies for this vulnerability require both immediate patching and long-term architectural improvements within the media handling framework. Google must release security patches that enforce strict validation rules on all DNG metadata fields before they are passed to rendering engines, ensuring that any anomalous values trigger safe failure modes rather than proceeding with potentially hazardous operations. Developers should implement robust error handling routines that catch exceptions during image decoding and prevent them from propagating up the call stack in a way that crashes system services. Furthermore, adopting stricter sandboxing policies for media processing components can limit the blast radius of such exploits by isolating the rendering logic from critical privilege boundaries. Users are advised to keep their devices updated with the latest security patches provided by manufacturers, as these updates typically include fixes for known vulnerabilities in core libraries like libstagefright and Skia. Additionally, restricting automatic scanning or previewing of files from untrusted sources can reduce exposure until comprehensive system-level protections are deployed across all supported device models.