CVE-2020-37277 PocketMine-MP before 3.15.4 Denial of Service via InventoryTransaction
Malicious clients can crash PocketMine-MP servers by sending crafted inventory transaction packets that cause exponential processing complexity.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-37277?
CVE-2020-37277 is a high-severity denial of service vulnerability in pmmp PocketMine-MP, published on 6 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
PocketMine-MP versions before 3.15.4 contain a denial of service vulnerability in the InventoryTransaction component's findResultItem() method. Malicious clients can send specially crafted InventoryTransactionPackets with multiple conflicting pathways to cause exponential processing complexity, freezing the server.
Weakness: CWE-400
Which versions are affected by CVE-2020-37277?
2 open source packages ship an affected version, including pocketmine/pocketmine-mp.
| Package | Affected | Fixed in |
|---|---|---|
pocketmine/pocketmine-mp Packagist | All versions | 3.15.4 |
pocketmine/pocketmine-mp Packagist | All versions | 3.15.4 |
How do I fix CVE-2020-37277?
Upgrade pocketmine/pocketmine-mp to 3.15.4 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2020-37277 being exploited?
There is no known exploitation of CVE-2020-37277 in the wild and no public exploit code.
Sources
Also known as GHSA-8jq6-w5cg-wm45, GHSA-w7p4-2gxc-qg89.