CVE-2015-6838: n/a vulnerability

CVE-2015-6838: 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...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 07:36 UTC (UTC+00:00)

Security readout for executives and security teams

This flaw can let a remote attacker crash a vulnerable PHP application by sending a specially crafted XML document. The known impact is denial of service, not data theft or code execution, based on the supplied sources. Exposure is most likely in legacy PHP 5.x applications using the XSL extension or XSLTProcessor with libxml2 before 2.9.2, especially where XML input can be influenced by remote users. Prioritize remediation where legacy PHP services are internet-facing, process customer-supplied XML, or support critical workflows. Otherwise, handle through legacy platform retirement and normal patch governance. Mitigation focus: Upgrade PHP to 5.4.45, 5.5.29, 5.6.13, or a supported newer release.; Ensure the runtime uses libxml2 2.9.2 or later where applicable.; Apply relevant distribution security updates from Debian, Gentoo, or your vendor..

Prepared: Jun 13, 2026, 14:22 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: May 16, 2016, 10:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://bugs.php.net/bug.php?id=69782CVE reference · x_refsource_CONFIRM
GLSA-201606-10CVE reference · vendor-advisory, x_refsource_GENTOO

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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