What is CVE-2016-4343?

CVE-2016-4343 is a high-severity vulnerability in PHP, classified under Access of Uninitialized Pointer. CVSS score: 8.8/10. Published 2016-05-22.

How severe is CVE-2016-4343?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2016-4343 known to be exploited?

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

Vulnerability in PHP

CVE-2016-4343

The phar_make_dirstream function in ext/phar/dirstream.c in PHP before 5.6.18 and 7.x before 7.0.3 mishandles zero-size ././@LongLink files, which allows remote attackers to cause a denial of service (uninitialized pointer dereference) or possibly have unspecified other impact via a crafted TAR archive.

Published 2016-05-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.042 (90.6th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 90.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.042 · newest: 0.042 · change: -0.000

Affected products

PHP
openSUSE — versions 13.2

Weakness classification (CWE)

CWE-824 — Access of Uninitialized Pointer

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay (Third Party Advisory)
php.net/ChangeLog-5.php (Release Notes, Vendor Advisory)
bugs.php.net/bug.php (Exploit, Issue Tracking, Vendor Advisory)
rhn.redhat.com/errata/RHSA-2016-2750.html (vendor-advisory, Third Party Advisory)
php.net/ChangeLog-7.php (Release Notes, Vendor Advisory)
www.openwall.com/lists/oss-security/2016/04/28/2 (mailing-list, Mailing List, Third Party Advisory)
www.securityfocus.com/bid/89179 (VDB Entry, Third Party Advisory, vdb-entry)
h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay (Third Party Advisory)
h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay (Third Party Advisory)
lists.opensuse.org/opensuse-updates/2016-05/msg00086.html (vendor-advisory, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2016-4343?: CVE-2016-4343 is a high-severity vulnerability in PHP, classified under Access of Uninitialized Pointer. CVSS score: 8.8/10. Published 2016-05-22.
How severe is CVE-2016-4343?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2016-4343 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.