Heap-based buffer overflow in PHP - CVE-2008-5557

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Main Vulnerability Database Vulnerabilities #VU110332

Heap-based buffer overflow in PHP - CVE-2008-5557

Published: October 11, 2018 / Updated: June 8, 2025


Vulnerability identifier: #VU110332
CSH Severity: High
CVSS v4.0:
CVE-ID: CVE-2008-5557
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: PHP Group
Affected software:
PHP

Detailed vulnerability description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in Heap-based buffer overflow in ext/mbstring/libmbfl/filters/mbfilter_htmlent.c in the mbstring extension in PHP 4.3.0 through 5.2.6. A remote attacker can use a crafted string containing an HTML entity to trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


How to mitigate CVE-2008-5557

Install update from vendor's website.

Sources