Vulnerability Database

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Total vulnerabilities in the database

PocketMine-MP: Network amplification vulnerability with `ActorEventPacket` — pocketmine / pocketmine-mp

Insufficient Control of Network Message Volume (Network Amplification)

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: Apr 6, 2026
  • Updated: Apr 7, 2026
  • GHSA: GHSA-7hmv-4j2j-pp6f
  • Severity: Medium
  • Exploit:
  • CISA KEV:

CVSS v3:

  • Severity: Medium
  • Score: 4.3
  • AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CWEs:

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A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

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