Critical severity9.8NVD Advisory· Published May 22, 2016· Updated Jun 17, 2026
CVE-2016-4538
CVE-2016-4538
Description
The bcpowmod function in ext/bcmath/bcmath.c in PHP before 5.5.35, 5.6.x before 5.6.21, and 7.x before 7.0.6 modifies certain data structures without considering whether they are copies of the _zero_, _one_, or _two_ global variable, which allows remote attackers to cause a denial of service or possibly have unspecified other impact via a crafted call.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
43cpe:2.3:a:php:php:*:*:*:*:*:*:*:*+ 28 more
- cpe:2.3:a:php:php:*:*:*:*:*:*:*:*range: <=5.5.33
- cpe:2.3:a:php:php:5.6.0:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.1:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.10:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.11:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.12:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.13:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.14:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.15:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.16:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.17:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.18:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.19:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.2:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.20:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.3:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.4:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.5:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.6:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.7:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.8:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.9:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:7.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:7.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:7.0.2:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:7.0.3:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:7.0.4:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:7.0.5:*:*:*:*:*:*:*
- (no CPE)range: before 5.5.35, before 5.6.21, before 7.0.6
- cpe:2.3:o:fedoraproject:fedora:24:*:*:*:*:*:*:*
- osv-coords12 versionspkg:rpm/suse/php53&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP2-LTSSpkg:rpm/suse/php53&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP3-LTSSpkg:rpm/suse/php53&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP3-TERADATApkg:rpm/suse/php53&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4pkg:rpm/suse/php53&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2011%20SP4pkg:rpm/suse/php53&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2011%20SP4pkg:rpm/suse/php53&distro=SUSE%20Manager%202.1pkg:rpm/suse/php53&distro=SUSE%20Manager%20Proxy%202.1pkg:rpm/suse/php53&distro=SUSE%20OpenStack%20Cloud%205pkg:rpm/suse/php5&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Web%20and%20Scripting%2012pkg:rpm/suse/php5&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012pkg:rpm/suse/php5&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP1
< 5.3.17-47.1+ 11 more
- (no CPE)range: < 5.3.17-47.1
- (no CPE)range: < 5.3.17-71.1
- (no CPE)range: < 5.3.17-71.1
- (no CPE)range: < 5.3.17-71.1
- (no CPE)range: < 5.3.17-71.1
- (no CPE)range: < 5.3.17-71.1
- (no CPE)range: < 5.3.17-71.1
- (no CPE)range: < 5.3.17-71.1
- (no CPE)range: < 5.3.17-71.1
- (no CPE)range: < 5.5.14-59.2
- (no CPE)range: < 5.5.14-59.2
- (no CPE)range: < 5.5.14-59.2
Patches
Vulnerability mechanics
References
15- php.net/ChangeLog-5.phpnvdPatch
- php.net/ChangeLog-7.phpnvdPatch
- bugs.php.net/bug.phpnvdExploit
- lists.fedoraproject.org/pipermail/package-announce/2016-May/183736.htmlnvd
- lists.opensuse.org/opensuse-updates/2016-05/msg00086.htmlnvd
- lists.opensuse.org/opensuse-updates/2016-06/msg00027.htmlnvd
- rhn.redhat.com/errata/RHSA-2016-2750.htmlnvd
- www.debian.org/security/2016/dsa-3602nvd
- www.openwall.com/lists/oss-security/2016/05/05/21nvd
- www.securityfocus.com/bid/90173nvd
- git.php.netnvd
- h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplaynvd
- h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplaynvd
- h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplaynvd
- security.gentoo.org/glsa/201611-22nvd
News mentions
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