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zend_mm_heap corrupted when serializing/unserializing Enum #181

Open
@earthiverse

Description

This one works fine:

enum Random: int
{
 case One = 1;
 case Two = 2;
 case Three = 3;
 case Four = 4;
 case Five = 5;
}
$value = (object)[
 'one' => Random::One
];
$serialized = msgpack_serialize($value);
$unserialized = msgpack_unserialize($serialized);

This one seems to fail with zend_mm_heap corrupted after running

enum Random: int
{
 case One = 1;
 case Two = 2;
 case Three = 3;
 case Four = 4;
 case Five = 5;
}
$value = (object)[
 'one' => Random::One
];
$serialized = msgpack_serialize($value);
$unserialized = msgpack_unserialize($serialized);
$serialized2 = msgpack_serialize($value);
$unserialized = msgpack_unserialize($serialized);

Using the object methods also fails:

$value = (object)[
 'one' => Random::One
];
$packer = new \MessagePack(true);
$unpacker = new \MessagePackUnpacker(true);
$serialized = $packer->pack($value);
$unpacker->feed($serialized);
$unpacker->execute();
$unserialized = $unpacker->data();
$unpacker->reset();
$serialized2 = $packer->pack($value);
$unpacker->feed($serialized);
$unpacker->execute();
$unserialized2 = $unpacker->data();
$unpacker->reset();

Errors in both

PHP 8.4.14 (cli) (built: Oct 24 2025 19:07:34) (NTS)
Copyright (c) The PHP Group
Built by https://github.com/docker-library/php
Zend Engine v4.4.14, Copyright (c) Zend Technologies
 with Zend OPcache v8.4.14, Copyright (c), by Zend Technologies
 with Xdebug v3.4.7, Copyright (c) 2002-2025, by Derick Rethans

and

PHP 8.4.16 (cli) (built: Dec 16 2025 16:03:34) (NTS)
Copyright (c) The PHP Group
Built by Homebrew
Zend Engine v4.4.16, Copyright (c) Zend Technologies
 with Xdebug v3.5.0, Copyright (c) 2002-2025, by Derick Rethans
 with Zend OPcache v8.4.16, Copyright (c), by Zend Technologies

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