PocketMine-MP: Network amplification vulnerability with ActorEventPacket

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

4.3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS

No dated EPSS signal available.

As published by the source; long descriptions are shortened.

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.

Published by the source

6 Apr 2026, 22:54 UTC

Last modified by the source

6 Apr 2026, 22:54 UTC

Source last checked

26 Oct 2026, 14:39 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-7hmv-4j2j-pp6f

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# Patch Next advisory brief: GHSA-7hmv-4j2j-pp6f

Advisory: PocketMine-MP: Network amplification vulnerability with `ActorEventPacket`
IDs: GHSA-7hmv-4j2j-pp6f
Record: https://patchnext.com/advisories/ghsa-7hmv-4j2j-pp6f (revision 1, source checked 26 Oct 2026, 14:39 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: pocketmine/pocketmine-mp 5.39.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist pocketmine/pocketmine-mp: affected < 5.39.2; fixed in 5.39.2

## Suggested inspection (read-only)
- Packagist pocketmine/pocketmine-mp: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on pocketmine/pocketmine-mp.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-7hmv-4j2j-pp6f (GitHub-reviewed advisory GHSA-7hmv-4j2j-pp6f lists affected ranges: Packagist pocketmine/pocketmine-mp >=0 <5.39.2)

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