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Fencer Intel
critical 9.8

CVE-2016-9936 in the critical feed json

The unserialize implementation in ext/standard/var.c in PHP 7.x before 7.0.14 allows remote attackers to cause a denial of service (use-aft…

published 2017-01-04 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-10723

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.3%
EPSS 4.3% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

The unserialize implementation in ext/standard/var.c in PHP 7.x before 7.0.14 allows remote attackers to cause a denial of service (use-after-free) or possibly have unspecified other impact via crafted serialized data. NOTE: this vulnerability exists because of an incomplete fix for CVE-2015-6834.

Patch / fix

  • php7.0 Ubuntu 16.04 LTS 7.0.15-0ubuntu0.16.04.2

ubuntu advisories UBUNTU-CVE-2016-9936

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • rh-php70-php RHEL 3 SOFTWARE_COLLECTIONS 7.0.27-1.el6
  • rh-php70-php RHEL 3 SOFTWARE_COLLECTIONS 7.0.27-1.el7
  • rh-php70-php-gd RHEL 3 SOFTWARE_COLLECTIONS 7.0.27-1.el6
  • rh-php70-php-gd RHEL 3 SOFTWARE_COLLECTIONS 7.0.27-1.el7
  • rh-php70-php-cli RHEL 3 SOFTWARE_COLLECTIONS 7.0.27-1.el6
  • rh-php70-php-cli RHEL 3 SOFTWARE_COLLECTIONS 7.0.27-1.el7
  • rh-php70-php-dba RHEL 3 SOFTWARE_COLLECTIONS 7.0.27-1.el6
  • rh-php70-php-dba RHEL 3 SOFTWARE_COLLECTIONS 7.0.27-1.el7

red hat advisories RHSA-2018:1296

  • php7 SLE Software Development Kit 12 SP2, SLE Software Development Kit 12 SP1, SLE Module for Web and Scripting 12 7.0.7-28.2

suse advisories SUSE-SU-2017:0017-1

  • php Arch Linux 7.1.1-0

arch linux advisories AVG-105

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-9936 updated cvss 7.5

php: Use After Free in unserialize()

  • Red Hat Enterprise Linux 5 php, php53 Red Hat Enterprise Linux 6 php, php-gd, php-cli, php-dba, php-fpm, php-pdo, +20 more Red Hat Enterprise Linux 7 php, php-gd, php-cli, php-dba, php-fpm, php-pdo, +18 more Red Hat OpenShift Enterprise 2 php Red Hat Software Collections rh-php56-php, rh-php56-php-gd, rh-php56-php-cli, rh-php56-php-dba, rh-php56-php-dbg, rh-php56-php-fpm, +22 more
    affected: no fix planned “Will not fix”
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) rh-php70-php 7.0.27-1.el6, rh-php70-php-gd 7.0.27-1.el6, rh-php70-php-cli 7.0.27-1.el6, rh-php70-php-dba 7.0.27-1.el6, rh-php70-php-dbg 7.0.27-1.el6, rh-php70-php-fpm 7.0.27-1.el6, +24 more Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-php70-php 7.0.27-1.el7, rh-php70-php-gd 7.0.27-1.el7, rh-php70-php-cli 7.0.27-1.el7, rh-php70-php-dba 7.0.27-1.el7, rh-php70-php-dbg 7.0.27-1.el7, rh-php70-php-fpm 7.0.27-1.el7, +22 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.7) rh-php70-php 7.0.27-1.el6, rh-php70-php-gd 7.0.27-1.el6, rh-php70-php-cli 7.0.27-1.el6, rh-php70-php-dba 7.0.27-1.el6, rh-php70-php-dbg 7.0.27-1.el6, rh-php70-php-fpm 7.0.27-1.el6, +24 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.3) rh-php70-php 7.0.27-1.el7, rh-php70-php-gd 7.0.27-1.el7, rh-php70-php-cli 7.0.27-1.el7, rh-php70-php-dba 7.0.27-1.el7, rh-php70-php-dbg 7.0.27-1.el7, rh-php70-php-fpm 7.0.27-1.el7, +22 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.4) rh-php70-php 7.0.27-1.el7, rh-php70-php-gd 7.0.27-1.el7, rh-php70-php-cli 7.0.27-1.el7, rh-php70-php-dba 7.0.27-1.el7, rh-php70-php-dbg 7.0.27-1.el7, rh-php70-php-fpm 7.0.27-1.el7, +22 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5) rh-php70-php 7.0.27-1.el7, rh-php70-php-gd 7.0.27-1.el7, rh-php70-php-cli 7.0.27-1.el7, rh-php70-php-dba 7.0.27-1.el7, rh-php70-php-dbg 7.0.27-1.el7, rh-php70-php-fpm 7.0.27-1.el7, +22 more
    +2 more products
    Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) rh-php70-php 7.0.27-1.el6, rh-php70-php-gd 7.0.27-1.el6, rh-php70-php-cli 7.0.27-1.el6, rh-php70-php-dba 7.0.27-1.el6, rh-php70-php-dbg 7.0.27-1.el6, rh-php70-php-fpm 7.0.27-1.el6, +24 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-php70-php 7.0.27-1.el7, rh-php70-php-gd 7.0.27-1.el7, rh-php70-php-cli 7.0.27-1.el7, rh-php70-php-dba 7.0.27-1.el7, rh-php70-php-dbg 7.0.27-1.el7, rh-php70-php-fpm 7.0.27-1.el7, +22 more
    fixed: vendor fix RHSA-2018:1296

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

4.27% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • bugs.php.net https://bugs.php.net/bug.php?id=72978 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.