CVE-2006-4812

What it is

Integer overflow in PHP 5 up to 5.1.6 and 4 before 4.3.0 allows remote attackers to execute arbitrary code via an argument to the unserialize PHP function with a large value for the number of array elements, which triggers the overflow in the Zend Engine ecalloc function (Zend/zend_alloc.c).

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.

Exploit odds

20.7% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2006-09-15 00:00 UTC ReservedThe CVE id was reserved by its CNA
2. 2006-10-10 04:06 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2026-06-16 22:29 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 20.7% in the next 30 days (EPSS).
• Severity: 10.0 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2006-10-10 04:06 UTC

Last modified

2026-06-16 22:29 UTC

Exploit probability

20.7% · EPSS, next 30 days

Weakness

CWE-94 · Code injection

Record status

Modified

Affected

• PHP 4.0
• PHP 4.0.1
• PHP 4.0.2
• PHP 4.0.3
• PHP 4.0.4
• PHP 4.0.5
• PHP 4.0.6
• PHP 4.0.7

Attack profile CVSS 2.0 · 10.0

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2006-4812.md and follow it. Check whether this project is affected by CVE-2006-4812. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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