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Vulnerability record · CVE-2016-5771 · published 7 August 2016

CVE-2016-5771: Php use after free vulnerability

Php · Php

spl_array.c in the SPL extension in PHP before 5.5.37 and 5.6.x before 5.6.23 improperly interacts with the unserialize implementation and garbage collection, which allows remote attackers to execute arbitrary code or cause a denial of service (use-after-free and application crash) via crafted serialized data.

9.8 CVSS 3.1 Critical EPSS 15% · top 3.3% CWE-416 · Use after free
9.8CVSS 3.1 base score, v2 7.5
15%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
24References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

spl_array.c in the SPL extension in PHP before 5.5.37 and 5.6.x before 5.6.23 improperly interacts with the unserialize implementation and garbage collection, which allows remote attackers to execute arbitrary code or cause a denial of service (use-after-free and application crash) via crafted serialized data.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

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

References

LinkTags
http://github.com/php/php-src/commit/3f627e580acfdaf0595ae3b115b8bec677f203ee?w=1 PatchThird Party Advisory
http://lists.apple.com/archives/security-announce/2016/Sep/msg00006.html Broken LinkMailing List
http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00004.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-updates/2016-08/msg00003.html Mailing ListThird Party Advisory
http://php.net/ChangeLog-5.php PatchRelease NotesVendor Advisory
http://rhn.redhat.com/errata/RHSA-2016-2750.html Third Party Advisory
http://www.debian.org/security/2016/dsa-3618 Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/06/23/4 Mailing ListPatchThird Party Advisory
http://www.securityfocus.com/bid/91401 Third Party AdvisoryVDB Entry
https://bugs.php.net/bug.php?id=72433 ExploitIssue TrackingVendor Advisory
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05240731 Third Party Advisory
https://support.apple.com/HT207170 Third Party Advisory
http://github.com/php/php-src/commit/3f627e580acfdaf0595ae3b115b8bec677f203ee?w=1 PatchThird Party Advisory
http://lists.apple.com/archives/security-announce/2016/Sep/msg00006.html Broken LinkMailing List
http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00004.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-updates/2016-08/msg00003.html Mailing ListThird Party Advisory
http://php.net/ChangeLog-5.php PatchRelease NotesVendor Advisory
http://rhn.redhat.com/errata/RHSA-2016-2750.html Third Party Advisory
http://www.debian.org/security/2016/dsa-3618 Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/06/23/4 Mailing ListPatchThird Party Advisory
http://www.securityfocus.com/bid/91401 Third Party AdvisoryVDB Entry
https://bugs.php.net/bug.php?id=72433 ExploitIssue TrackingVendor Advisory
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05240731 Third Party Advisory
https://support.apple.com/HT207170 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2016-5771), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.