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**Name of the Vulnerable Software and Affected Versions** Vapor versions prior to 4.61.1 **Description** The issue is related to unbounded, attacker-controlled stack growth, which can lead to a stack overflow and a process crash when using automatic content decoding. An attacker can craft a request body to make the server crash. The estimated number of potentially affected devices is not specified. **Recommendations** For Vapor versions prior to 4.61.1, update to version 4.61.1 to resolve the issue. As a temporary workaround, consider disabling the `ContentConfiguration` to prevent the use of Form URL Encoded data decoding. Alternatively, restrict the use of the `URLEncodedFormDecoder` to minimize the risk of exploitation.

**Name of the Vulnerable Software and Affected Versions** Vapor versions prior to 4.60.3 **Description** Vapor is an HTTP web framework for Swift. Users with FileMiddleware enabled are vulnerable to an integer overflow vulnerability that can crash the application. This issue can be triggered by invalid range headers. **Recommendations** For versions prior to 4.60.3, update to version 4.60.3 to resolve the issue. As a temporary workaround, consider disabling FileMiddleware and serve assets via a Content Delivery Network.

**Name of the Vulnerable Software and Affected Versions** Leafkit versions prior to 1.3.0 **Description** Leafkit is a templating language with Swift-inspired syntax. The issue affects anyone passing unsanitised data to Leaf's variable tags. Before the fix, Leaf would not escape any strings passed to tags as variables. If an attacker managed to find a variable that was rendered with their unsanitised data, they could inject scripts into a generated Leaf page, which could enable Cross-site Scripting (XSS) attacks if other mitigations such as a Content Security Policy were not enabled. **Recommendations** For versions prior to 1.3.0, update to version 1.3.0 to resolve the issue. As a temporary workaround, sanitize any untrusted input before passing it to Leaf and enable a Content Security Policy to block inline script and CSS data.

**Name of the Vulnerable Software and Affected Versions** Vapor versions prior to 4.40.1 **Description** The issue allows for a Denial of Service (DoS) attack against Vapor applications that have a metrics backend enabled. An attacker can send unlimited requests with different paths to a Vapor instance, creating unlimited counters and timers that will eventually drain the system. Downstream services may also be affected as they could be spammed with error paths. **Recommendations** For versions prior to 4.40.1, upgrade to version 4.40.1, where the `DefaultResponder` will rewrite any undefined route paths to `vapor route undefined` to avoid unlimited counters. As a temporary workaround, consider not bootstrapping a metrics system until the issue is resolved.