ext/curl/interface.c in PHP 7.x before 7.0.10 does not work around a libcurl integer overflow, which allows remote attackers to cause a denial of service (allocation error and heap-based buffer overflow) or possibly have unspecified other impact via a long string that is mishandled in a curl_escape call.
http://openwall.com/lists/oss-security/2016/09/02/9
http://www.php.net/ChangeLog-7.php
http://www.securityfocus.com/bid/92766
http://www.securitytracker.com/id/1036680
https://bugs.php.net/bug.php?id=72674
https://github.com/php/php-src/commit/72dbb7f416160f490c4e9987040989a10ad431c7?w=1
Source: MITRE
Published: 2016-09-12
Updated: 2017-08-16
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