The php_url_parse_ex function in ext/standard/url.c in PHP before 5.5.38 allows remote attackers to cause a denial of service (buffer over-read) or possibly have unspecified other impact via vectors involving the smart_str data type.
http://git.php.net/?p=php-src.git;a=commit;h=629e4da7cc8b174acdeab84969cbfc606a019b31
http://lists.apple.com/archives/security-announce/2016/Sep/msg00006.html
http://openwall.com/lists/oss-security/2016/07/24/2
http://php.net/ChangeLog-5.php
http://rhn.redhat.com/errata/RHSA-2016-2750.html
http://www.securityfocus.com/bid/92111
Source: MITRE
Published: 2016-07-25
Updated: 2018-01-05
Type: CWE-119
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