Perl before 5.26.3 and 5.28.0 before 5.28.1 has a buffer overflow via a crafted regular expression that triggers invalid write operations.
https://www.oracle.com/security-alerts/cpujul2020.html
https://www.debian.org/security/2018/dsa-4347
https://usn.ubuntu.com/3834-1/
https://security.netapp.com/advisory/ntap-20190221-0003/
https://security.gentoo.org/glsa/201909-01
https://rt.perl.org/Public/Bug/Display.html?id=133423
https://metacpan.org/changes/release/SHAY/perl-5.28.1
https://metacpan.org/changes/release/SHAY/perl-5.26.3
https://bugzilla.redhat.com/show_bug.cgi?id=1646734
https://access.redhat.com/errata/RHSA-2019:0010
https://access.redhat.com/errata/RHSA-2019:0001