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.

Integer overflow in fetch on FreeBSD 4.1 through 5.3 allows remote malicious servers to execute arbitrary code via certain HTTP headers in an HTTP response, which lead to a buffer overflow.