Ubuntu and Debian already fixed this in uw-imap, from what I could find, this corresponds to c-client package in Alpine Linux (https://pkgs.alpinelinux.org/package/v3.10/main/x86_64/c-client)

Ubuntu bug https://bugs.launchpad.net/ubuntu/+source/php-imap/+bug/1834340

Could this package be updated with the ubuntu/debian patch please?