CVE-2026-58560 in HarmonyOS
Summary
by MITRE • 08/17/2026
Null pointer dereference issue in the image codec module. Impact: Successful exploitation of this vulnerability may affect availability.
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Analysis
by VulDB Data Team • 08/17/2026
The identified null pointer dereception flaw resides within the image codec subsystem, a critical component responsible for parsing and rendering various graphic file formats such as JPEG, PNG, or BMP. This type of vulnerability typically arises when the software fails to adequately validate input data before attempting to access memory locations referenced by pointers that have not been properly initialized or assigned valid addresses. In the context of an image codec, this often occurs during the processing of malformed or specially crafted image files where specific header fields, dimension values, or metadata structures contain unexpected null values or zero-length indicators. When the decoder logic proceeds under the assumption that these references point to allocated memory buffers, it attempts to read from or write to address zero, which is universally reserved and inaccessible in modern operating system architectures.
From a technical perspective, this error represents a classic CWE-476: NULL Pointer Dereference vulnerability. The root cause lies in insufficient input validation within the parsing routine. Instead of checking whether a pointer returned by an allocation function or derived from file metadata is non-null before dereferencing it, the code proceeds directly to memory access operations. This lack of defensive programming allows an attacker who can supply arbitrary image data to trigger this condition deterministically. The vulnerability does not inherently provide direct control over instruction pointers for remote code execution in most standard configurations, as accessing address zero typically results in a segmentation fault or similar operating system-level protection mechanism that terminates the offending process immediately.
The primary operational impact of exploiting this null pointer dereference is on service availability rather than confidentiality or integrity. When an application utilizing the vulnerable image codec encounters this flaw during the processing of maliciously crafted input, it will crash abruptly due to a segmentation fault. In environments where such codecs are used in server-side applications, web services that accept user-uploaded images, or automated batch processing pipelines, these crashes can lead to denial-of-service conditions. If the application is not designed with robust error handling and automatic restart mechanisms, repeated exploitation by an attacker could render the service unavailable to legitimate users. Furthermore, if multiple threads are affected simultaneously, it may cause instability in the broader system hosting the vulnerable component.
Mitigation strategies for this vulnerability must focus on rigorous input validation and defensive coding practices within the image codec module. Developers should implement explicit checks to ensure that all pointers derived from external data sources or internal allocation routines are non-null before any memory access operations are performed. Additionally, incorporating bounds checking and validating structural integrity of image headers against known specifications can prevent malformed inputs from reaching critical code paths. On a system level, deploying runtime protection mechanisms such as Address Space Layout Randomization (ASLR) and Data Execution Prevention (DEP) can help mitigate the consequences by making exploitation more difficult and containing crashes to individual processes rather than compromising the entire host operating system. Regular security audits focused on memory safety issues are also recommended to identify similar patterns across the codebase.