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+```mdx
+---
+title: 'ComfyUI v0.3.40'
+description: 'Release notes for ComfyUI version 0.3.40 including new nodes, security updates, and improvements'
+---
+
+# ComfyUI v0.3.40
+
+<Note>
+This release includes contributions from three new contributors to the project and includes multiple template version bumps for improved stability.
+</Note>
+
+## New Features
+
+<CodeGroup>
+
+<Update>
+### Node Additions
+- **ImageStitch Node** - New functionality to concatenate images
+- **GetImageSize Node** - Added capability to retrieve image dimensions with batch support 
+- **Regex Replace Node** - New node for performing regex substitution operations
+</Update>
+
+<Update>
+### Interface Improvements
+- **Help Menu** - Introduced in NodeLibrarySidebarTab for improved user guidance
+- **Custom Node Support** - Added ability to read pyproject.toml from custom nodes
+</Update>
+
+</CodeGroup>
+
+## Improvements
+
+<CodeGroup>
+
+<Update>
+### Frontend & Performance
+- Multiple frontend updates (v1.21.0 through v1.21.7) with various enhancements
+- Implemented fused multiply-add pointwise operations in chroma for better efficiency
+</Update>
+
+<Update>
+### API Enhancements
+- Improved handling of lists of tensors for models
+- Better support for custom comfy-api-base with subpath functionality 
+- Added API nodes documentation to readme
+</Update>
+
+<Update>
+### Platform Support
+- Improved ROCm version handling for better feature enablement
+</Update>
+
+</CodeGroup>
+
+## Security Updates
+
+<Warning>
+Enhanced security fix for potential XSS vulnerability on /view endpoint
+</Warning>
+
+## Bug Fixes
+
+<CodeGroup>
+
+<Update type="fixed">
+### Core Fixes
+- Replaced deprecated Pillow API call (Image.ANTIALIAS)
+- Multiple frontend bug fixes through version updates
+- Various style and formatting improvements
+</Update>
+
+</CodeGroup>
+
+## Other Changes
+
+<CodeGroup>
+
+<Update type="changed">
+### Maintenance
+- Cleanup of BFL API nodes for Kontext [pro] and [max]
+- Updated issue templates to include custom node testing requirements
+- Code ownership updates and documentation improvements
+</Update>
+
+</CodeGroup>
+```
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