The iconv program in the GNU C Library (aka glibc or libc6) 2.31 and earlier, when invoked with multiple suffixes in the destination encoding (TRANSLATE or IGNORE) along with the -c option, enters an infinite loop when processing invalid multi-byte input sequences, leading to a denial of service.
https://www.oracle.com/security-alerts/cpuapr2022.html
https://sourceware.org/bugzilla/show_bug.cgi?id=26224
https://sourceware.org/bugzilla/show_bug.cgi?id=19519#c21
https://sourceware.org/bugzilla/show_bug.cgi?id=19519
https://security.gentoo.org/glsa/202101-20
https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html