GHSA-fqx3-r75h-vc89: Pocketmine/pocketmine mp Improperly Checked IDs On Itemstacks Vulnerability

HIGH
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CVSS 7.5
Published
Advisory Summary

GHSA-fqx3-r75h-vc89 is a HIGH (CVSS 7.5) improperly checked ids on itemstacks vulnerability (General Security Weakness) affecting Pocketmine/pocketmine mp libraries in the Packagist ecosystem. The issue involves improperly checked ids on itemstacks received from the client leading to server crash in pocketmine-mp. Remediation is available by upgrading affected packages to version 4.4.2.

GHSA-fqx3-r75h-vc89 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-fqx3-r75h-vc89
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification General Security Weakness
Affected Product Pocketmine/pocketmine mp
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 7.5

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

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

How to Fix GHSA-fqx3-r75h-vc89

To remediate this vulnerability, upgrade all affected Pocketmine/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: 4.4.2 
Upgrade pocketmine/pocketmine-mp to 4.4.2
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-fqx3-r75h-vc89, inspect your project dependencies for Pocketmine/pocketmine mp:

inspect dependencies for pocketmine/pocketmine-mp

Analyze the terminal output to locate any version of Pocketmine/pocketmine mp in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.4.2), 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 General Security Weakness. In Pocketmine/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 Due to a workaround for unmapped network items implemented in 4.0.0-BETA5 (8ac16345a3bc099b62c1f5cfbf3b736e621c3f76), arbitrary item IDs are able to be written into an item's NBT. The intended purpose of this is to make said unmapped network items able to be moved around the inventory without issues. This led to an exploit due to internal limits on the range that item IDs can occupy (-32768 - 32767), while the tag type used to represent the replacement IDs for unknown items is a `TAG_Int`, allowing a range from -(2^31) - 2^31 - 1. This leads to an uncaught exception which crashes the server. ### Patches 5fd685e07d61ef670584ed11a52fd5f4b99a81a7 ### Workarounds In theory this can be checked by plugins using a custom `TypeConverter`, but this is likely to be very cumbersome. ### For more information If you have any questions or comments about this advisory: * Email us at [team@pmmp.io](mailto:team@pmmp.io)

GHSA-fqx3-r75h-vc89 Affected Pocketmine/pocketmine mp Versions

1 component(s)
Fixed Versions:
4.4.2
Product / Package Ecosystem Affected Versions Fixed Version
pocketmine/pocketmine-mp
 Packagist
≥ 4.0.0-BETA5
< 4.4.2
4.4.2

References

GitHub Advisory / Wiki ADVISORY
https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-fqx3-r75h-vc89
Security Fix Commit FIX COMMIT
https://github.com/pmmp/PocketMine-MP/commit/5fd685e07d61ef670584ed11a52fd5f4b99a81a7
Security Fix Commit FIX COMMIT
https://github.com/pmmp/PocketMine-MP/commit/8ac16345a3bc099b62c1f5cfbf3b736e621c3f76
Pocketmine/pocketmine mp Source Repository REPOSITORY
https://github.com/pmmp/PocketMine-MP

Frequently Asked Questions

What is GHSA-fqx3-r75h-vc89?
GHSA-fqx3-r75h-vc89 is a security vulnerability in Pocketmine/pocketmine mp involving Improperly checked IDs on itemstacks received from the client leading to server crash in PocketMine-MP under General Security Weakness.
Which Pocketmine/pocketmine mp versions are affected?
Affected versions include releases prior to 4.4.2 across affected packages: pocketmine/pocketmine-mp.
What version fixes GHSA-fqx3-r75h-vc89?
Upgrading to 4.4.2 (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 4.4.2. Upgrade your dependency to 4.4.2 or later.
What is the CVSS score of GHSA-fqx3-r75h-vc89?
GHSA-fqx3-r75h-vc89 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with GHSA-fqx3-r75h-vc89?
GHSA-fqx3-r75h-vc89 is classified under General Security Weakness.
How can I check Packagist dependencies for GHSA-fqx3-r75h-vc89?
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-fqx3-r75h-vc89",
  "modified" : "2025-12-26T17:28:57Z",
  "published" : "2022-06-07T21:07:31Z",
  "aliases" : [ ],
  "summary" : "Improperly checked IDs on itemstacks received from the client leading to server crash in PocketMine-MP",
  "details" : "### Impact\nDue to a workaround for unmapped network items implemented in 4.0.0-BETA5 (8ac16345a3bc099b62c1f5cfbf3b736e621c3f76), arbitrary item IDs are able to be written into an item's NBT. The intended purpose of this is to make said unmapped network items able to be moved around the inventory without issues.\n\nThis led to an exploit due to internal limits on the range that item IDs can occupy (-32768 - 32767), while the tag type used to represent the replacement IDs for unknown items is a `TAG_Int`, allowing a range from -(2^31) - 2^31 - 1. This leads to an uncaught exception which crashes the server.\n\n### Patches\n5fd685e07d61ef670584ed11a52fd5f4b99a81a7\n\n### Workarounds\nIn theory this can be checked by plugins using a custom `TypeConverter`, but this is likely to be very cumbersome.\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Email us at [team@pmmp.io](mailto:team@pmmp.io)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "pocketmine/pocketmine-mp"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.0.0-BETA5"
      }, {
        "fixed" : "4.4.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-fqx3-r75h-vc89"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pmmp/PocketMine-MP/commit/5fd685e07d61ef670584ed11a52fd5f4b99a81a7"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pmmp/PocketMine-MP/commit/8ac16345a3bc099b62c1f5cfbf3b736e621c3f76"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/pmmp/PocketMine-MP"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-06-07T21:07:31Z",
    "nvd_published_at" : null
  }
}