What is CVE-2016-7411?

CVE-2016-7411 is a critical-severity vulnerability in PHP, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2016-09-17.

How severe is CVE-2016-7411?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in PHP

CVE-2016-7411

ext/standard/var_unserializer.re in PHP before 5.6.26 mishandles object-deserialization failures, which allows remote attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via an unserialize call that references a partially constructed object.

Vulnerability class: Buffer Overflow

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

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.056 (92.7th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 92.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.056 · newest: 0.056 · change: 0.000

Affected products

Weakness classification (CWE)

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

References

security.gentoo.org/glsa/201611-22 (vendor-advisory)
www.securitytracker.com/id/1036836 (vdb-entry)
bugs.php.net/bug.php (Exploit, Issue Tracking)
www.openwall.com/lists/oss-security/2016/09/15/10 (mailing-list, Mailing List)
github.com/php/php-src/commit/6a7cc8ff85827fa9ac715b3a83c2d9147f33cd43 (Patch, Issue Tracking)
www.php.net/ChangeLog-5.php (Release Notes)
www.securityfocus.com/bid/93009 (vdb-entry)

Frequently asked questions

What is CVE-2016-7411?: CVE-2016-7411 is a critical-severity vulnerability in PHP, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2016-09-17.
How severe is CVE-2016-7411?: Critical severity. CVSS v3 base score is 9.8 out of 10.