Description
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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | php5 | 5.4.45-0+deb7u3 | DLA-499-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | php5 | 5.5.9+dfsg-1ubuntu4.16 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 2 | rh-php56 +2 | 2.3-1.el6 | RHSA-2016:2750 |
| RHEL 2 | rh-php56-php +27 | 5.6.25-1.el6 | RHSA-2016:2750 |
| RHEL 2 | rh-php56-php-pear | 1:1.9.5-4.el6 | RHSA-2016:2750 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP1 | php5 | 5.5.14-56.1 | SUSE-SU-2016:1277-1 |
| SLES 12 | php5 | 5.5.14-56.1 | SUSE-SU-2016:1277-1 |
| SLES 11 SP4 | php53 | 5.3.17-62.1 | SUSE-SU-2016:1581-1, SUSE-SU-2016:1310-1 |
| SLES 11 SP3 | php53 | 5.3.17-71.1 | SUSE-SU-2016:1581-1 |
| SLES 11 SP2 | php53 | 5.3.17-47.1 | SUSE-SU-2016:1638-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 11 SP4 | php53 | 5.3.17-62.1 | SUSE-SU-2016:1581-1, SUSE-SU-2016:1310-1 |
| SUSE OpenStack Cloud 5 | php53 | 5.3.17-71.1 | SUSE-SU-2016:1581-1 |
| SUSE Manager Proxy 2.1 | php53 | 5.3.17-71.1 | SUSE-SU-2016:1581-1 |
| SUSE Manager 2.1 | php53 | 5.3.17-71.1 | SUSE-SU-2016:1581-1 |
Advisories 6
- RHSA-2016:2750 Red Hat Security Advisory: rh-php56 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- DLA-499-1 php5 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2016:1638-1 Security update for php53 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:1310-1 Security update for php53 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:1277-1 Security update for php5 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:1581-1 Security update for php53 SUSE / openSUSE Security Updates · May 2, 2025
References
- USN-2952-1 vendor-advisory
- http://git.php.net/?p=php-src.git%3Ba=commit%3Bh=de31324c221c1791b26350ba106cc26bad23ace9
- https://bugs.launchpad.net/ubuntu/+source/php5/+bug/1509817
- RHSA-2016:2750 vendor-advisory
- USN-2952-2 vendor-advisory
- http://www.php.net/ChangeLog-5.php
- https://bugs.php.net/bug.php?id=64938
- 87470 vdb-entry
- openSUSE-SU-2016:1274 vendor-advisory
- SUSE-SU-2016:1277 vendor-advisory
- [oss-security] 20160423 Re: CVE request: PHP issues fixed in 7.0.5, 5.6.20 and 5.5.34 releases mailing-list
- openSUSE-SU-2016:1373 vendor-advisory