CVE-2015-6838 Affecting libxml2-2.9.1 package, versions <2.9.1+e1


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
8.13% (95th percentile)

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  • Snyk IDSNYK-ECHOLATEST-LIBXML2291-21429759
  • published22 Oct 2026
  • disclosed16 May 2016

Introduced: 16 May 2016

CVE-2015-6838  (opens in a new tab)

How to fix?

Upgrade Echo:latest libxml2-2.9.1 to version 2.9.1+e1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libxml2-2.9.1 package and not the libxml2-2.9.1 package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

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 Base Scores

version 3.1