An issue was discovered in Perl 5.18 through 5.26. A crafted regular expression can cause a heap-based buffer overflow, with control over the bytes written.
http://www.securitytracker.com/id/1040681
http://www.securitytracker.com/id/1042004
https://access.redhat.com/errata/RHSA-2018:1192
https://rt.perl.org/Public/Bug/Display.html?id=132227
https://security.gentoo.org/glsa/201909-01
https://usn.ubuntu.com/3625-1/
Source: MITRE
Published: 2018-04-17
Updated: 2020-08-24
Type: CWE-787
Base Score: 7.5
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 10
Severity: HIGH
Base Score: 9.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 3.9
Severity: CRITICAL