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# Description of Changes - Refactored `isPrivateAddress` to improve detection of private and local addresses for both IPv4 and IPv6. - Added explicit handling for: - IPv4-mapped IPv6 addresses - IPv6 link-local, site-local, and unique local (fc00::/7) addresses - Additional IPv4 private ranges such as link-local (169.254.0.0/16) - Introduced `normalizeIpv4MappedAddress` to standardize IP checks in cloud metadata detection. - Replaced `switch` statement with modern `switch` expression for cleaner control flow. These changes were made to strengthen SSRF protection by covering more address edge cases, especially in mixed IPv4/IPv6 environments. This also improves detection of cloud metadata endpoints when accessed via IPv4-mapped IPv6 addresses. --- ## Checklist ### General - [x] I have read the [Contribution Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md) - [x] I have read the [Stirling-PDF Developer Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md) (if applicable) - [ ] I have read the [How to add new languages to Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md) (if applicable) - [ ] I have performed a self-review of my own code - [x] My changes generate no new warnings ### Documentation - [ ] I have updated relevant docs on [Stirling-PDF's doc repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/) (if functionality has heavily changed) - [ ] I have read the section [Add New Translation Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags) (for new translation tags only) ### UI Changes (if applicable) - [ ] Screenshots or videos demonstrating the UI changes are attached (e.g., as comments or direct attachments in the PR) ### Testing (if applicable) - [ ] I have tested my changes locally. Refer to the [Testing Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing) for more details. --------- Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>