ext/libxml/libxml.c in PHP before 5.5.22 and 5.6.x before 5.6.6, when PHP-FPM is used, does not isolate each thread from libxml_disable_entity_loader changes in other threads, which allows remote attackers to conduct XML External Entity (XXE) and XML Entity Expansion (XEE) attacks via a crafted XML document, a related issue to CVE-2015-5161.
http://git.php.net/?p=php-src.git;a=commit;h=de31324c221c1791b26350ba106cc26bad23ace9
http://www.openwall.com/lists/oss-security/2016/04/24/1
http://www.php.net/ChangeLog-5.php
https://bugs.launchpad.net/ubuntu/+source/php5/+bug/1509817
https://bugs.php.net/bug.php?id=64938
http://www.securityfocus.com/bid/87470
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00031.html
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00033.html
http://www.ubuntu.com/usn/USN-2952-1
http://www.ubuntu.com/usn/USN-2952-2
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00056.html
Source: MITRE
Published: 2016-05-22
Updated: 2022-07-20
Type: CWE-611
Base Score: 6.8
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 8.6
Severity: MEDIUM
Base Score: 9.6
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Impact Score: 6
Exploitability Score: 2.8
Severity: CRITICAL