Versions mentioned in the description apply to the upstream
Remediation section below for
Alpine:3.13 relevant versions.
libfetch before 2021-07-26, as used in apk-tools, xbps, and other products, mishandles numeric strings for the FTP and HTTP protocols. The FTP passive mode implementation allows an out-of-bounds read because strtol is used to parse the relevant numbers into address bytes. It does not check if the line ends prematurely. If it does, the for-loop condition checks for the '\0' terminator one byte too late.
apk-tools to version 2.12.6-r0 or higher.