GHSA-7hmv-4j2j-pp6f: PocketMine-MP Network Amplification Vulnerability With `ActorEventPacket` Vulnerability

MODERATE
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CVSS 4.3
CWE-406
Published
Advisory Summary

GHSA-7hmv-4j2j-pp6f is a MODERATE (CVSS 4.3) network amplification vulnerability with `actoreventpacket` vulnerability (CWE-406: Insufficient Control of Network Message Volume (Network Amplification)) affecting PocketMine-MP libraries in the Packagist ecosystem. The issue involves network amplification vulnerability with `actoreventpacket`. Remediation is available by upgrading affected packages to version 5.39.2.

GHSA-7hmv-4j2j-pp6f at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-7hmv-4j2j-pp6f
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-406: Insufficient Control of Network Message Volume (Network Amplification)
Affected Product PocketMine-MP
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 4.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix GHSA-7hmv-4j2j-pp6f

To remediate this vulnerability, upgrade all affected PocketMine-MP dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

pocketmine/pocketmine-mp fixed: 5.39.2 
Upgrade pocketmine/pocketmine-mp to 5.39.2
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for pocketmine/pocketmine-mp

How to Check if You Are Affected

To determine whether your application is affected by GHSA-7hmv-4j2j-pp6f, inspect your project dependencies for PocketMine-MP:

inspect dependencies for pocketmine/pocketmine-mp

Analyze the terminal output to locate any version of PocketMine-MP in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.39.2), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-406: Insufficient Control of Network Message Volume (Network Amplification), where the product does not sufficiently monitor or control transmitted network traffic volume, so that an actor can cause the product to transmit more traffic than should be allowed for that actor. In PocketMine-MP, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### 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.

GHSA-7hmv-4j2j-pp6f Affected PocketMine-MP Versions

1 component(s)
Fixed Versions:
5.39.2
Product / Package Ecosystem Affected Versions Fixed Version
pocketmine/pocketmine-mp
 Packagist
< 5.39.2
5.39.2

References

GitHub Advisory / Wiki ADVISORY
https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-7hmv-4j2j-pp6f
Security Fix Commit FIX COMMIT
https://github.com/pmmp/PocketMine-MP/commit/aeea1150a772a005b92bd418366f1b7cf1a91ab5
PocketMine-MP Source Repository REPOSITORY
https://github.com/pmmp/PocketMine-MP

Frequently Asked Questions

What is GHSA-7hmv-4j2j-pp6f?
GHSA-7hmv-4j2j-pp6f is a security vulnerability in PocketMine-MP involving Network amplification vulnerability with `ActorEventPacket` under CWE-406: Insufficient Control of Network Message Volume (Network Amplification).
Which PocketMine-MP versions are affected?
Affected versions include releases prior to 5.39.2 across affected packages: pocketmine/pocketmine-mp.
What version fixes GHSA-7hmv-4j2j-pp6f?
Upgrading to 5.39.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is pocketmine/pocketmine-mp affected?
Yes, pocketmine/pocketmine-mp is affected in releases prior to 5.39.2. Upgrade your dependency to 5.39.2 or later.
What is the CVSS score of GHSA-7hmv-4j2j-pp6f?
GHSA-7hmv-4j2j-pp6f has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with GHSA-7hmv-4j2j-pp6f?
GHSA-7hmv-4j2j-pp6f is classified under CWE-406: Insufficient Control of Network Message Volume (Network Amplification) (The product does not sufficiently monitor or control transmitted network traffic volume, so that an actor can cause the product to transmit more traffic than should be allowed for that actor.).
How can I check Packagist dependencies for GHSA-7hmv-4j2j-pp6f?
Run the dependency tree command: 'inspect dependencies for pocketmine/pocketmine-mp'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-7hmv-4j2j-pp6f",
  "modified" : "2026-04-06T22:54:10Z",
  "published" : "2026-04-06T22:54:10Z",
  "aliases" : [ ],
  "summary" : "PocketMine-MP: Network amplification vulnerability with `ActorEventPacket`",
  "details" : "### Impact\nThe server handles `ActorEventPacket` to trigger consuming animations from vanilla clients when they eat food or drink potions.\n\nThis 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.\n\nThis 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.\n\n### Patches\nThe 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.\n\n### Workarounds\nA plugin could use `DataPacketDecodeEvent` to rate-limit `ActorEventPacket` to prevent the attack.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "pocketmine/pocketmine-mp"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.39.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-7hmv-4j2j-pp6f"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pmmp/PocketMine-MP/commit/aeea1150a772a005b92bd418366f1b7cf1a91ab5"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/pmmp/PocketMine-MP"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-406" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-06T22:54:10Z",
    "nvd_published_at" : null
  }
}