PocketMine-MP: Network amplification vulnerability with `ActorEventPacket`GHSA-7hmv-4j2j-pp6f
MEDIUMFix: pmmp/PocketMine-MP@aeea115GHSA-7hmv-4j2j-pp6f is a medium-severity (CVSS 4.3) CWE-406 vulnerability in pocketmine/pocketmine-mp. A fix is available for pocketmine/pocketmine-mp — see the affected versions and patch details below.
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-7hmv-4j2j-pp6f.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
pocketmine/pocketmine-mpReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.
Description
Impact
The server handles ActorEventPacket to trigger consuming animations from vanilla clients when they eat food or drink potions.
This can be abused to make the server spam other clients, and to waste server CPU and memory. For every ActorEventPacket sent by the client, an animation event will be sent to every other player the attacker is visible to.
This is similar to various other vulnerabilities which were fixed in the network overhaul of PM4 (e.g. AnimatePacket and LevelSoundEventPacket), but somehow this one slipped through the net.
Patches
The problem was addressed in aeea1150a772a005b92bd418366f1b7cf1a91ab5 by changing the mechanism for consuming animations to be fully controlled by the server. ActorEventPacket from the client is now discarded.
Workarounds
A plugin could use DataPacketDecodeEvent to rate-limit ActorEventPacket to prevent the attack.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | pocketmine/pocketmine-mp | all versions | 5.39.2composer require pocketmine/pocketmine-mp:^5.39.2 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for pocketmine/pocketmine-mp, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update pocketmine/pocketmine-mp to 5.39.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-7hmv-4j2j-pp6f is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
Frequently Asked Questions
Is GHSA-7hmv-4j2j-pp6f in your dependencies?
Find it across Packagist, including transitive dependencies.