Description
Double free vulnerability in the _php_mb_regex_ereg_replace_exec function in php_mbregex.c in the mbstring extension in PHP before 5.5.37, 5.6.x before 5.6.23, and 7.x before 7.0.8 allows remote attackers to execute arbitrary code or cause a denial of service (application crash) by leveraging a callback exception.
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 8 | php5 | 5.6.23+dfsg-0+deb8u1 | DSA-3618-1 |
| Debian 7 | php5 | 5.4.45-0+deb7u5 | DLA-628-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | php7.0 | 7.0.8-0ubuntu0.16.04.1 | USN-3045-1 |
| Ubuntu 14.04 LTS | php5 | 5.5.9+dfsg-1ubuntu4.19 | USN-3045-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | php +24 | 5.4.16-42.el7 | RHSA-2016:2598 |
| 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 | 5.5.14-68.1 | SUSE-SU-2016:1842-1 |
| SLES 12 | php5 | 5.5.14-68.1 | SUSE-SU-2016:1842-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | php +24 | 5.4.16-42.el7 | ELSA-2016-2598 |
Advisories 7
- RHSA-2016:2750 Red Hat Security Advisory: rh-php56 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- RHSA-2016:2598 Red Hat Security Advisory: php security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- USN-3045-1 php5, php7.0 vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-628-1 php5 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3618-1 php5 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2016:1842-1 Security update for php5 SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2016-2598 Moderate: php security and bug fix update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 9, 2016
References
- APPLE-SA-2016-09-20 vendor-advisory
- openSUSE-SU-2016:1761 vendor-advisory
- openSUSE-SU-2016:1922 vendor-advisory
- RHSA-2016:2750 vendor-advisory
- RHSA-2016:2598 vendor-advisory
- http://php.net/ChangeLog-5.php
- https://bugs.php.net/bug.php?id=72402
- http://github.com/php/php-src/commit/5b597a2e5b28e2d5a52fc1be13f425f08f47cb62?w=1
- [oss-security] 20160623 Re: CVE for PHP 5.5.37 issues mailing-list
- DSA-3618 vendor-advisory
- http://php.net/ChangeLog-7.php
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05240731
- https://support.apple.com/HT207170
- 91396 vdb-entry