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.

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.