Is CVE-2026-86203 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-86203 being exploited in the wild.

How severe is CVE-2026-86203?

Low severity, with a CVSS score of 3.7, published 9 September 2026.

Which products and versions are affected?

pocketmine/pocketmine-mp (Packagist) ECOSYSTEM:introduced=0,fixed=5.39.2.

Is there a fix for CVE-2026-86203?

Yes. pocketmine/pocketmine-mp (Packagist): upgrade to 5.39.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-86203 attacked?

It is attacked over the network.

Am I affected by CVE-2026-86203?

Check whether you run pocketmine/pocketmine-mp (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-86203: PocketMine-MP item duplication via despawn entity attack race condition

CVE-2026-86203 · Severity: low · CVSS 3.7 · Published 2026-09-09

PocketMine-MP is a Minecraft server implementation used to host multiplayer game servers. A race condition allows an attacker to kill a player who is disconnecting and trigger multiple death events, causing inventory items and experience to drop multiple times, enabling item duplication. While the impact is limited to in-game items, this can undermine server economy and gameplay fairness on affected servers.

Technologies: pocketmine/pocketmine-mp (Packagist). Vendors: Packagist.

Quick answers

Is CVE-2026-86203 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-86203 being exploited in the wild.
How severe is CVE-2026-86203?: Low severity, with a CVSS score of 3.7, published 9 September 2026.
Which products and versions are affected?: pocketmine/pocketmine-mp (Packagist) ECOSYSTEM:introduced=0,fixed=5.39.2.
Is there a fix for CVE-2026-86203?: Yes. pocketmine/pocketmine-mp (Packagist): upgrade to 5.39.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-86203 attacked?: It is attacked over the network.
Am I affected by CVE-2026-86203?: Check whether you run pocketmine/pocketmine-mp (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

pocketmine/pocketmine-mp (Packagist): upgrade to 5.39.2 or later
```
composer require pocketmine/pocketmine-mp:^5.39.2
```

Technical details

The vulnerability is a race condition in entity state validation (CWE-664: Improper Control of a Resource Through its Lifetime). When a player disconnects or dies, the entity is flagged for despawn but remains in the World entity table. If an attack packet from another client arrives during a narrow timing window, the handler calls World.getEntity() without checking the flagged-for-despawn state, allowing the death handler to execute multiple times. Attack vector is network-based (another player sends attack packets) with high complexity (precise timing required) and no authentication required. An attacker can duplicate items by timing an attack on a disconnecting victim. The vulnerability was patched in version 5.39.2.

Affected products

PocketMine PocketMine-MP before 5.39.2

Identifiers

CVE-2026-86203
GHSA-f9jp-856v-8642

Timeline

2026-04-04: disclosed
2026-05-09: patched: Fixed in version 5.39.2

References

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