CVE-2026-86203 PocketMine-MP before 5.39.2 Item Duplication via Despawn State
Attackers can duplicate items and experience by exploiting a race condition in entity despawn handling, affecting PocketMine-MP server administrators.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-86203?
CVE-2026-86203 is a medium-severity vulnerability in pmmp PocketMine-MP, published on 9 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
PocketMine-MP versions before 5.39.2 fail to validate entity despawn state when processing attack packets from clients. Attackers can exploit a race condition by attacking a disconnecting player to trigger multiple death handlers, causing inventory items and experience to drop multiple times for duplication.
Weakness: CWE-664
Which versions are affected by CVE-2026-86203?
2 open source packages ship an affected version, including pocketmine/pocketmine-mp.
| Package | Affected | Fixed in |
|---|---|---|
pocketmine/pocketmine-mp Packagist | All versions | 5.39.2 |
pocketmine/pocketmine-mp Packagist | All versions | 5.39.2 |
How do I fix CVE-2026-86203?
Upgrade pocketmine/pocketmine-mp to 5.39.2 or later.
Is CVE-2026-86203 being exploited?
There is no known exploitation of CVE-2026-86203 in the wild and no public exploit code.
Sources
Also known as GHSA-9pw9-9mpc-9mc3, GHSA-f9jp-856v-8642.