In the GNU C Library (aka glibc or libc6) through 2.28, the getaddrinfo
function would successfully parse a string that contained an IPv4 address
followed by whitespace and arbitrary characters, which could lead
applications to incorrectly assume that it had parsed a valid string,
without the possibility of embedded HTTP headers or other potentially
dangerous substrings.

mdeslaur	glibc uses this internally to parse config files, fixing this may introduce unwanted regressions and changes in behaviour
leosilva	See CVE-2019-18348 for Python that is affected by this issue.