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Vulnerability record · CVE-2015-6838 · published 16 May 2016

CVE-2015-6838: Php vulnerability

Php · Php

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.

7.5 CVSS 3.0 High EPSS 7.3% · top 5.9%
7.5CVSS 3.0 base score, v2 5.0
7.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

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.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://php.net/ChangeLog-5.php
http://www.debian.org/security/2015/dsa-3358
http://www.securityfocus.com/bid/76733
http://www.securitytracker.com/id/1033548
https://bugs.php.net/bug.php?id=69782
https://security.gentoo.org/glsa/201606-10
http://php.net/ChangeLog-5.php
http://www.debian.org/security/2015/dsa-3358
http://www.securityfocus.com/bid/76733
http://www.securitytracker.com/id/1033548
https://bugs.php.net/bug.php?id=69782
https://security.gentoo.org/glsa/201606-10

Track CVE-2015-6838 inside VULONE

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2015-6838), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.