What’s Vulnerable › Vulnerabilities

CVE-2016-4344

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2016-05-22 · updated 2026-06-17
• Weakness: CWE-190

Description

Integer overflow in the xml_utf8_encode function in ext/xml/xml.c in PHP before 7.0.4 allows remote attackers to cause a denial of service or possibly have unspecified other impact via a long argument to the utf8_encode function, leading to a heap-based buffer overflow.

Affected products

• PHP: from 7.0.0 before 7.0.4 — fixed in 7.0.4

How to fix

Upgrade to a fixed version: PHP 7.0.4. Check the vendor advisory for mitigations.

References

• http://php.net/ChangeLog-7.php
• http://www.openwall.com/lists/oss-security/2016/04/28/2
• https://bugs.php.net/bug.php?id=71637
• http://php.net/ChangeLog-7.php
• http://www.openwall.com/lists/oss-security/2016/04/28/2
• https://bugs.php.net/bug.php?id=71637

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