CVE-2026-58936 in Android
Summary
by MITRE • 11/02/2026
In png_set_tRNS of pngset.c, there is a possible memory corruption due to a use-after-free. 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 • 11/02/2026
The vulnerability identified in the libpng library within the png_set_tRNS function represents a critical security flaw rooted in improper management of memory lifecycles during image processing operations. This specific instance involves a use-after-free condition, which occurs when software continues to access or manipulate a block of memory after it has been freed and potentially reallocated for other purposes. In the context of PNG file parsing, this defect allows an attacker who supplies a specially crafted malicious input file to trigger undefined behavior within the application's execution flow. The root cause lies in the failure to properly validate pointers or update references before deallocation occurs during the handling of transparency chunks, leading to scenarios where freed memory is subsequently written to or read from by subsequent function calls.
From a technical perspective, this use-after-free vulnerability falls under CWE-416, which categorizes errors related to using an invalid pointer after it has been released. The operational impact of such a flaw is severe because modern operating systems employ various memory protection mechanisms that can be bypassed through precise exploitation techniques. By carefully crafting the input data, an attacker can control the contents of the freed memory block or manipulate heap metadata to achieve arbitrary code execution. This means that when a victim application processes the malicious PNG file, it may execute attacker-supplied shellcode with the same privileges as the vulnerable process. The severity is further amplified by the fact that no additional user interaction beyond opening or rendering the image is required for exploitation, making this vulnerability highly attractive to automated attack campaigns and drive-by download scenarios.
The exploitability of this flaw aligns with several tactics defined in the MITRE ATT&CK framework, particularly those related to initial access and execution via client-side attacks. Attackers can distribute malicious PNG files through email attachments, web pages, or file-sharing platforms, relying on the victim's software automatically parsing the image without explicit consent for code execution. Since libpng is widely used across numerous applications including browsers, image viewers, and document processors, the attack surface is extensive. The lack of required user interaction significantly lowers the barrier to entry for attackers, allowing them to target systems remotely with minimal effort once a vulnerable application version is identified in the wild.
Mitigation strategies must focus on both immediate remediation and long-term defensive engineering practices. The primary solution involves applying vendor-provided patches that correct the memory management logic within png_set_tRNS to ensure pointers are nullified after free operations or that references are validated before use. Organizations should prioritize updating their libpng dependencies across all affected systems and applications. Additionally, implementing defense-in-depth measures such as heap hardening techniques, including Address Space Layout Randomization (ASLR) and Data Execution Prevention (DEP), can mitigate the likelihood of successful code execution even if the vulnerability is triggered. Security teams should also consider deploying intrusion detection signatures that monitor for anomalous memory access patterns associated with use-after-free exploits in image processing libraries to detect potential exploitation attempts in real-time.