Function iconv_mime_decode_headers() in PHP versions 7.1.x below 7.1.30, 7.2.x below 7.2.19 and 7.3.x below 7.3.6 may perform out-of-buffer read due to integer overflow when parsing MIME headers. This may lead to information disclosure or crash.
lists.opensuse.org/opensuse-security-announce/2019-07/msg00029.html
access.redhat.com/errata/RHSA-2019:2519
access.redhat.com/errata/RHSA-2019:3299
bugs.php.net/bug.php?id=78069
seclists.org/bugtraq/2019/Sep/35
seclists.org/bugtraq/2019/Sep/38
www.debian.org/security/2019/dsa-4527
www.debian.org/security/2019/dsa-4529