{"record":{"id":"cf929fb26a893513","repo":"SixLabors/ImageSharp","slug":"attempted-to-allocate-a-buffer-of-length-length-that","errorCode":null,"errorMessage":"Attempted to allocate a buffer of length={length} that exceeded the limit {limit}.","messagePattern":"Attempted to allocate a buffer of length=(.+?) that exceeded the limit (.+?)\\.","errorType":"exception","errorClass":"InvalidMemoryOperationException","httpStatus":null,"severity":"error","filePath":"src/ImageSharp/Memory/InvalidMemoryOperationException.cs","lineNumber":41,"sourceCode":"    /// <summary>\n    /// Initializes a new instance of the <see cref=\"InvalidMemoryOperationException\"/> class.\n    /// </summary>\n    public InvalidMemoryOperationException()\n    {\n    }\n\n    [DoesNotReturn]\n    internal static void ThrowNegativeAllocationException(long length) =>\n        throw new InvalidMemoryOperationException($\"Attempted to allocate a buffer of negative length={length}.\");\n\n    [DoesNotReturn]\n    internal static void ThrowInvalidAlignmentException(long alignment) =>\n        throw new InvalidMemoryOperationException(\n                $\"The buffer capacity of the provided MemoryAllocator is insufficient for the requested buffer alignment: {alignment}.\");\n\n    [DoesNotReturn]\n    internal static void ThrowAllocationOverLimitException(ulong length, long limit) =>\n            throw new InvalidMemoryOperationException($\"Attempted to allocate a buffer of length={length} that exceeded the limit {limit}.\");\n\n    [DoesNotReturn]\n    internal static void ThrowAccumulativeAllocationOverLimitException(long requestedLength, long totalLength, long limit) =>\n            throw new InvalidMemoryOperationException(\n                $\"Attempted to allocate a buffer of length={requestedLength} that would increase the accumulative allocation size to {totalLength}, exceeding the limit {limit}.\");\n}\n","sourceCodeStart":23,"sourceCodeEnd":48,"githubUrl":"https://github.com/SixLabors/ImageSharp/blob/59ce6af6fc29027cda277ef62d4d1694a8acce91/src/ImageSharp/Memory/InvalidMemoryOperationException.cs#L23-L48","documentation":"Thrown when a single buffer allocation request exceeds the allocator's configured single-allocation limit (AllocationLimit / SingleBufferAllocationLimit). It is a safety guard against runaway memory use from corrupt headers or logic bugs, not an out-of-memory condition per se.","triggerScenarios":"MemoryAllocator.Allocate<T>/Allocate2D requests whose byte length (as ulong) exceeds the allocator's limit — e.g. decoding a very large image into a full-frame buffer when the limit was set lower.","commonSituations":"Processing extremely large images (huge width*height) under a conservative memory limit; the ImageSharp configuration was set up with AllocationLimit for server environments and a legitimately large file arrives; corrupt headers inflating computed sizes.","solutions":["Raise the allocation limit in your Configuration: configuration.MemoryAllocator with a higher SingleBufferAllocationLimit (or limit in AllocateMemoryOptions), sized for your workload.","Check the image's declared dimensions with Image.Identify before full decode and reject files whose computed buffer size exceeds available memory.","Use streaming/progressive decode paths or process the image in tiles instead of one full-frame buffer."],"exampleFix":"// before\nvar config = new Configuration(); // default/small limit\nusing var image = Image.Load<Rgba32>(config, hugePath); // throws\n// after\nvar allocator = Configuration.Default.MemoryAllocator;\n// configure allocator with a larger SingleBufferAllocationLimit for big-image workloads\nusing var image = Image.Load<Rgba32>(bigImageConfig, hugePath);","handlingStrategy":"try-catch","validationCode":"bool exceedsLimit(long pixelCount, long byteLimit) =>\n    pixelCount * 4L > byteLimit; // RGBA estimate\n// check via Image.Identify before full load","typeGuard":null,"tryCatchPattern":"try { using var image = Image.Load(config, stream); }\ncatch (InvalidMemoryOperationException ex) when (ex.Message.Contains(\"exceeded the limit\"))\n{ /* reject file or reload with a higher-limit configuration */ }","preventionTips":["Run Image.Identify first and pre-reject images whose computed buffer size exceeds your limit.","Set the allocator's single-buffer limit to a value matched to your largest legitimate workload.","Prefer tiled/streamed processing for very large images instead of one full-frame allocation."],"tags":["memory","allocation-limit","large-images","configuration"],"backgroundTag":"file-size-limit-exceeded","analyzedSha":"59ce6af6fc29027cda277ef62d4d1694a8acce91","analyzedAt":"2026-09-13T18:34:59.331Z","contentChangedAt":"2026-09-13T18:34:59.331Z","schemaVersion":2},"datasetVersion":"2026-09-16T04:17:20.429Z"}