php: NULL pointer dereference in XSLTProcessor class
Published May 16, 2016
7.5
HIGHCVSS 3.0
EPSS 8.13%
Description
The xsl_ext_function_php function in ext/xsl/xsltprocessor.c in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13, when libxml2 before 2.9.2 is used, does not consider the possibility of a NULL valuePop return value before proceeding with a free operation after the principal argument loop, which allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted XML document, a different vulnerability than CVE-2015-6837.
Affected products
No data.
Configuration 1
- 5.6.0
- 5.6.0
- 5.6.0
- 5.6.0
- 5.6.0
- 5.6.0
- 5.6.0
- 5.6.0
- 5.6.0
- 5.6.1
- 5.6.2
- 5.6.3
- 5.6.4
- 5.6.5
- 5.6.6
- 5.6.7
- 5.6.8
- 5.6.9
- 5.6.10
- 5.6.11
- 5.6.12
Configuration 2
- 5.5.0
- 5.5.0
- 5.5.0
- 5.5.0
- 5.5.0
- 5.5.0
- 5.5.0
- 5.5.0
- 5.5.0
- 5.5.0
- 5.5.0
- 5.5.0
- 5.5.0
- 5.5.1
- 5.5.2
- 5.5.3
- 5.5.4
- 5.5.5
- 5.5.6
- 5.5.7
- 5.5.8
- 5.5.9
- 5.5.10
- 5.5.11
- 5.5.12
- 5.5.13
- 5.5.14
- 5.5.15
- 5.5.16
- 5.5.17
- 5.5.18
- 5.5.19
- 5.5.20
- 5.5.21
- 5.5.22
- 5.5.23
- 5.5.24
- 5.5.25
- 5.5.26
- 5.5.27
- 5.5.28
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 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 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
Red Hat statement
Red Hat Product Security has rated this issue as having Low security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
AV:N/AC:L/Au:N/C:N/I:N/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 1, 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 (19 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 8.13% (0.08132) | 94.67th | v5 (v2026.06.15) |
| Jun 15, 2026 | 7.28% (0.07276) | 93.54th | v5 (v2026.06.15) |
| Dec 28, 2025 | 3.80% (0.03804) | 87.73th | v4 (v2025.03.14) |
| Dec 27, 2025 | 1.92% (0.01920) | 82.94th | v4 (v2025.03.14) |
| Oct 28, 2025 | 3.79% (0.03793) | 87.56th | v4 (v2025.03.14) |
| Oct 27, 2025 | 1.92% (0.01915) | 82.73th | v4 (v2025.03.14) |
| Oct 1, 2025 | 3.79% (0.03793) | 87.66th | v4 (v2025.03.14) |
| Jul 30, 2025 | 1.92% (0.01920) | 82.58th | v4 (v2025.03.14) |
| Mar 30, 2025 | 4.38% (0.04377) | 87.91th | v4 (v2025.03.14) |
| Mar 29, 2025 | 13.00% (0.13002) | 90.10th | v4 (v2025.03.14) |
| Mar 17, 2025 | 4.38% (0.04377) | 88.21th | v4 (v2025.03.14) |
| Dec 12, 2024 | 2.78% (0.02776) | 90.97th | v3 (v2023.03.01) |
| Nov 8, 2023 | 2.78% (0.02776) | 89.49th | v3 (v2023.03.01) |
| Oct 27, 2023 | 3.56% (0.03563) | 90.54th | v3 (v2023.03.01) |
| Mar 7, 2023 | 3.93% (0.03926) | 90.61th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.32% (0.01319) | 71.27th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.32% (0.01319) | 71.23th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.32% (0.01319) | 69.22th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.32% (0.01319) | 44.98th | v2 (v2022.01.01) |
References (10)
- http://php.net/ChangeLog-5.php x_refsource_CONFIRM
- http://www.debian.org/security/2015/dsa-3358 vendor-advisoryx_refsource_DEBIAN
- http://www.securityfocus.com/bid/76733 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id/1033548 vdb-entryx_refsource_SECTRACK
- https://access.redhat.com/security/cve/CVE-2015-6838 Vendor Advisory
- https://bugs.php.net/bug.php?id=69782 x_refsource_CONFIRM
- https://bugzilla.redhat.com/show_bug.cgi?id=1260711 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2015-6838
- https://security.gentoo.org/glsa/201606-10 vendor-advisoryx_refsource_GENTOO
- https://www.cve.org/CVERecord?id=CVE-2015-6838
| Link | Providers | Tags |
|---|---|---|
| http://php.net/ChangeLog-5.php | x_refsource_CONFIRM | |
| http://www.debian.org/security/2015/dsa-3358 | vendor-advisoryx_refsource_DEBIAN | |
| http://www.securityfocus.com/bid/76733 | vdb-entryx_refsource_BID | |
| http://www.securitytracker.com/id/1033548 | vdb-entryx_refsource_SECTRACK | |
| https://access.redhat.com/security/cve/CVE-2015-6838 | Vendor Advisory | |
| https://bugs.php.net/bug.php?id=69782 | x_refsource_CONFIRM | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1260711 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2015-6838 | ||
| https://security.gentoo.org/glsa/201606-10 | vendor-advisoryx_refsource_GENTOO | |
| https://www.cve.org/CVERecord?id=CVE-2015-6838 |
Change history (0)
No recorded changes yet.