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Vulnerability record · CVE-2016-5768 · published 7 August 2016

CVE-2016-5768: Php double free vulnerability

Php · Php

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.

9.8 CVSS 3.0 Critical EPSS 9.6% · top 4.7% CWE-415 · Double free
9.8CVSS 3.0 base score, v2 7.5
9.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
28References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://github.com/php/php-src/commit/5b597a2e5b28e2d5a52fc1be13f425f08f47cb62?w=1
http://lists.apple.com/archives/security-announce/2016/Sep/msg00006.html
http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00004.html
http://lists.opensuse.org/opensuse-updates/2016-08/msg00003.html
http://php.net/ChangeLog-5.php PatchRelease Notes
http://php.net/ChangeLog-7.php Release Notes
http://rhn.redhat.com/errata/RHSA-2016-2598.html
http://rhn.redhat.com/errata/RHSA-2016-2750.html
http://www.debian.org/security/2016/dsa-3618
http://www.openwall.com/lists/oss-security/2016/06/23/4 Release Notes
http://www.securityfocus.com/bid/91396
https://bugs.php.net/bug.php?id=72402 ExploitVendor Advisory
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05240731
https://support.apple.com/HT207170
http://github.com/php/php-src/commit/5b597a2e5b28e2d5a52fc1be13f425f08f47cb62?w=1
http://lists.apple.com/archives/security-announce/2016/Sep/msg00006.html
http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00004.html
http://lists.opensuse.org/opensuse-updates/2016-08/msg00003.html
http://php.net/ChangeLog-5.php PatchRelease Notes
http://php.net/ChangeLog-7.php Release Notes
http://rhn.redhat.com/errata/RHSA-2016-2598.html
http://rhn.redhat.com/errata/RHSA-2016-2750.html
http://www.debian.org/security/2016/dsa-3618
http://www.openwall.com/lists/oss-security/2016/06/23/4 Release Notes
http://www.securityfocus.com/bid/91396
https://bugs.php.net/bug.php?id=72402 ExploitVendor Advisory
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05240731
https://support.apple.com/HT207170

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2016-5768), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.