What is CVE-2016-7418?

CVE-2016-7418 is a high-severity vulnerability in PHP, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.5/10. Published 2016-09-17.

How severe is CVE-2016-7418?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2016-7418 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in PHP

CVE-2016-7418

The php_wddx_push_element function in ext/wddx/wddx.c in PHP before 5.6.26 and 7.x before 7.0.11 allows remote attackers to cause a denial of service (invalid pointer access and out-of-bounds read) or possibly have unspecified other impact via an incorrect boolean element in a wddxPacket XML document, leading to mishandling in a wddx_deserialize call.

Vulnerability class: Buffer Overflow

Published 2016-09-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.114 (95.9th percentile), scored 2026-09-28.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 95.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.114 · newest: 0.114 · change: 0.000

Affected products

PHP — versions 7.0.0, 7.0.1, 7.0.2

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

Public proof-of-concept exploits

References

github.com/php/php-src/commit/c4cca4c20e75359c9a13a1f9a36cb7b4e9601d29 (Patch, Issue Tracking)
www.php.net/ChangeLog-7.php (Release Notes)
security.gentoo.org/glsa/201611-22 (vendor-advisory)
www.securitytracker.com/id/1036836 (vdb-entry)
www.openwall.com/lists/oss-security/2016/09/15/10 (mailing-list, Mailing List)
access.redhat.com/errata/RHSA-2018:1296 (vendor-advisory)
www.securityfocus.com/bid/93011 (vdb-entry)
www.php.net/ChangeLog-5.php (Release Notes)
www.tenable.com/security/tns-2016-19
bugs.php.net/bug.php (Exploit, Issue Tracking)

Frequently asked questions

What is CVE-2016-7418?: CVE-2016-7418 is a high-severity vulnerability in PHP, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.5/10. Published 2016-09-17.
How severe is CVE-2016-7418?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2016-7418 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.