An issue was discovered in certain Apple products. iOS before 10.3 is affected. macOS before 10.12.4 is affected. tvOS before 10.2 is affected. watchOS before 3.2 is affected. The issue involves nghttp2 before 1.17.0 in the "HTTPProtocol" component. It allows remote HTTP/2 servers to have an unspecified impact via unknown vectors.
https://support.apple.com/HT207617
https://support.apple.com/HT207615
https://support.apple.com/HT207602
https://support.apple.com/HT207601
https://github.com/nghttp2/nghttp2/releases/tag/v1.17.0