php: Use After Free Vulnerability in unserialize()
Published Jan 19, 2016
7.3
HIGHCVSS 3.1
EPSS 7.06%
Description
Multiple use-after-free vulnerabilities in SPL in PHP before 5.4.44, 5.5.x before 5.5.28, and 5.6.x before 5.6.12 allow remote attackers to execute arbitrary code via vectors involving (1) ArrayObject, (2) SplObjectStorage, and (3) SplDoublyLinkedList, which are mishandled during unserialization.
Affected products
No data.
Configuration 1
Configuration 2
- 7.0
- 8.0
No data.
Red Hat Software Collections for Red Hat Enterprise Linux 6
rh-php56-php-0:5.6.5-8.el6
Fixed · RHSA-2016:0457
Red Hat Software Collections for Red Hat Enterprise Linux 6.6 EUS
rh-php56-php-0:5.6.5-8.el6
Fixed · RHSA-2016:0457
Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS
rh-php56-php-0:5.6.5-8.el6
Fixed · RHSA-2016:0457
Red Hat Software Collections for Red Hat Enterprise Linux 7
rh-php56-php-0:5.6.5-8.el7
Fixed · RHSA-2016:0457
Red Hat Software Collections for Red Hat Enterprise Linux 7.1 EUS
rh-php56-php-0:5.6.5-8.el7
Fixed · RHSA-2016:0457
Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUS
rh-php56-php-0:5.6.5-8.el7
Fixed · RHSA-2016:0457
Red Hat Enterprise Linux 5
php
Will not fix
Red Hat Enterprise Linux 5
php53
Will not fix
Red Hat Enterprise Linux 6
php
Will not fix
Red Hat Enterprise Linux 7
php
Will not fix
Red Hat OpenShift Enterprise 2
php
Will not fix
Red Hat Software Collections
php54-php
Will not fix
Red Hat Software Collections
php55-php
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Software Collections for Red Hat Enterprise Linux 6 | rh-php56-php-0:5.6.5-8.el6 | Fixed | RHSA-2016:0457 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6.6 EUS | rh-php56-php-0:5.6.5-8.el6 | Fixed | RHSA-2016:0457 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS | rh-php56-php-0:5.6.5-8.el6 | Fixed | RHSA-2016:0457 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | rh-php56-php-0:5.6.5-8.el7 | Fixed | RHSA-2016:0457 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.1 EUS | rh-php56-php-0:5.6.5-8.el7 | Fixed | RHSA-2016:0457 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUS | rh-php56-php-0:5.6.5-8.el7 | Fixed | RHSA-2016:0457 |
| Red Hat Enterprise Linux 5 | php | Will not fix | n/a |
| Red Hat Enterprise Linux 5 | php53 | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | php | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | php | Will not fix | n/a |
| Red Hat OpenShift Enterprise 2 | php | Will not fix | n/a |
| Red Hat Software Collections | php54-php | Will not fix | n/a |
| Red Hat Software Collections | php55-php | Will not fix | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 7.06% (0.07057) | 94.02th | v5 (v2026.06.15) |
| Jun 15, 2026 | 7.06% (0.07057) | 93.36th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.71% (0.00714) | 70.65th | v4 (v2025.03.14) |
| Dec 12, 2024 | 2.25% (0.02245) | 89.95th | v3 (v2023.03.01) |
| Nov 8, 2023 | 2.19% (0.02192) | 88.18th | v3 (v2023.03.01) |
| Aug 2, 2023 | 0.63% (0.00633) | 76.33th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.45% (0.00447) | 71.01th | v3 (v2023.03.01) |
| Mar 6, 2023 | 10.05% (0.10052) | 94.55th | v2 (v2022.01.01) |
| Apr 1, 2022 | 10.05% (0.10052) | 94.06th | v2 (v2022.01.01) |
| Feb 4, 2022 | 10.05% (0.10052) | 87.55th | v2 (v2022.01.01) |
References (13)
- http://www.debian.org/security/2015/dsa-3344 vendor-advisoryx_refsource_DEBIAN
- http://www.openwall.com/lists/oss-security/2015/08/19/3 mailing-listx_refsource_MLIST
- http://www.php.net/ChangeLog-5.php x_refsource_CONFIRM
- http://www.securityfocus.com/bid/76737 vdb-entryx_refsource_BID
- https://access.redhat.com/security/cve/CVE-2015-6831 Vendor Advisory
- https://bugs.php.net/bug.php?id=70155 x_refsource_CONFIRM
- https://bugs.php.net/bug.php?id=70166 x_refsource_CONFIRM
- https://bugs.php.net/bug.php?id=70168 x_refsource_CONFIRM
- https://bugs.php.net/bug.php?id=70169 x_refsource_CONFIRM
- https://bugzilla.redhat.com/show_bug.cgi?id=1256290 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2015-6831
- https://security.gentoo.org/glsa/201606-10 vendor-advisoryx_refsource_GENTOO
- https://www.cve.org/CVERecord?id=CVE-2015-6831
| Link | Providers | Tags |
|---|---|---|
| http://www.debian.org/security/2015/dsa-3344 | vendor-advisoryx_refsource_DEBIAN | |
| http://www.openwall.com/lists/oss-security/2015/08/19/3 | mailing-listx_refsource_MLIST | |
| http://www.php.net/ChangeLog-5.php | x_refsource_CONFIRM | |
| http://www.securityfocus.com/bid/76737 | vdb-entryx_refsource_BID | |
| https://access.redhat.com/security/cve/CVE-2015-6831 | Vendor Advisory | |
| https://bugs.php.net/bug.php?id=70155 | x_refsource_CONFIRM | |
| https://bugs.php.net/bug.php?id=70166 | x_refsource_CONFIRM | |
| https://bugs.php.net/bug.php?id=70168 | x_refsource_CONFIRM | |
| https://bugs.php.net/bug.php?id=70169 | x_refsource_CONFIRM | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1256290 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2015-6831 | ||
| https://security.gentoo.org/glsa/201606-10 | vendor-advisoryx_refsource_GENTOO | |
| https://www.cve.org/CVERecord?id=CVE-2015-6831 |
Change history (0)
No recorded changes yet.