GHSA-g5rr-p69h-7v3g: Pocketmine/pocketmine mp Insufficient Type Validation Vulnerability

HIGH
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CVSS 7.5
CWE-1287 CWE-20
Published
Advisory Summary

GHSA-g5rr-p69h-7v3g is a HIGH (CVSS 7.5) insufficient type validation vulnerability (CWE-1287: Improper Validation of Specified Type of Input) affecting Pocketmine/pocketmine mp libraries in the Packagist ecosystem. The issue involves insufficient type validation in pocketmine/pocketmine-mp. Remediation is available by upgrading affected packages to version 4.2.9.

GHSA-g5rr-p69h-7v3g at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-g5rr-p69h-7v3g
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-1287: Improper Validation of Specified Type of Input
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-g5rr-p69h-7v3g

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: 4.2.9 
Upgrade pocketmine/pocketmine-mp to 4.2.9
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-g5rr-p69h-7v3g, 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 4.2.9), 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-1287: Improper Validation of Specified Type of Input, where the product receives input that is expected to be of a certain type, but it does not validate or incorrectly validates that the input is actually of the expected type. 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 When an inventory interaction is performed (e.g. moving an item around an inventory), the client sends a serialized version of the itemstack to the server, which the server then deserializes and compares against its own copy. If the copies don't match, the transaction is invalid. This involves deserializing item NBT from the client, which allows for bogus data to be provided. Usually, this is harmless, but in this particular case, it could result in crashes on certain types of bad data (e.g. incorrect ListTag type provided for the `CanDestroy` tag). ### Patches This is fixed in 4.2.9 by commit 5a98b08ee8dc8ff14862cd83d2e4af9d212fefc2. ### Workarounds It's non-trivial to workaround this, but can be done by handling `InventoryTransactionPacket` and `PlayerAuthInputPacket` to scrub inbound transaction data of bogus NBT that would cause these crashes. ### For more information * Email us at [team@pmmp.io](mailto:team@pmmp.io)

GHSA-g5rr-p69h-7v3g Affected Pocketmine/pocketmine mp Versions

1 component(s)
Fixed Versions:
4.2.9
Product / Package Ecosystem Affected Versions Fixed Version
pocketmine/pocketmine-mp
 Packagist
< 4.2.9
4.2.9

References

GitHub Advisory / Wiki ADVISORY
https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-g5rr-p69h-7v3g
Security Fix Commit FIX COMMIT
https://github.com/pmmp/PocketMine-MP/commit/5a98b08ee8dc8ff14862cd83d2e4af9d212fefc2
Pocketmine/pocketmine mp Source Repository REPOSITORY
https://github.com/pmmp/PocketMine-MP
Pocketmine/pocketmine mp Source Repository REPOSITORY
https://github.com/pmmp/PocketMine-MP/blob/4.2.9/changelogs/4.2.md#429
Pocketmine/pocketmine mp Release RELEASE
https://github.com/pmmp/PocketMine-MP/releases/tag/4.2.9

Frequently Asked Questions

What is GHSA-g5rr-p69h-7v3g?
GHSA-g5rr-p69h-7v3g is a security vulnerability in Pocketmine/pocketmine mp involving Insufficient type validation in pocketmine/pocketmine-mp under CWE-1287: Improper Validation of Specified Type of Input.
Which Pocketmine/pocketmine mp versions are affected?
Affected versions include releases prior to 4.2.9 across affected packages: pocketmine/pocketmine-mp.
What version fixes GHSA-g5rr-p69h-7v3g?
Upgrading to 4.2.9 (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 4.2.9. Upgrade your dependency to 4.2.9 or later.
What is the CVSS score of GHSA-g5rr-p69h-7v3g?
GHSA-g5rr-p69h-7v3g 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-g5rr-p69h-7v3g?
GHSA-g5rr-p69h-7v3g is classified under CWE-1287: Improper Validation of Specified Type of Input (The product receives input that is expected to be of a certain type, but it does not validate or incorrectly validates that the input is actually of the expected type.).
How can I check Packagist dependencies for GHSA-g5rr-p69h-7v3g?
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-g5rr-p69h-7v3g",
  "modified" : "2025-12-26T17:29:16Z",
  "published" : "2022-04-22T20:57:12Z",
  "aliases" : [ ],
  "summary" : "Insufficient type validation in pocketmine/pocketmine-mp",
  "details" : "### Impact\nWhen an inventory interaction is performed (e.g. moving an item around an inventory), the client sends a serialized version of the itemstack to the server, which the server then deserializes and compares against its own copy. If the copies don't match, the transaction is invalid.\n\nThis involves deserializing item NBT from the client, which allows for bogus data to be provided. Usually, this is harmless, but in this particular case, it could result in crashes on certain types of bad data (e.g. incorrect ListTag type provided for the `CanDestroy` tag).\n\n### Patches\nThis is fixed in 4.2.9 by commit 5a98b08ee8dc8ff14862cd83d2e4af9d212fefc2.\n\n### Workarounds\nIt's non-trivial to workaround this, but can be done by handling `InventoryTransactionPacket` and `PlayerAuthInputPacket` to scrub inbound transaction data of bogus NBT that would cause these crashes.\n\n### For more information\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" : "0"
      }, {
        "fixed" : "4.2.9"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-g5rr-p69h-7v3g"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pmmp/PocketMine-MP/commit/5a98b08ee8dc8ff14862cd83d2e4af9d212fefc2"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/pmmp/PocketMine-MP"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pmmp/PocketMine-MP/blob/4.2.9/changelogs/4.2.md#429"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pmmp/PocketMine-MP/releases/tag/4.2.9"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1287", "CWE-20" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-04-22T20:57:12Z",
    "nvd_published_at" : null
  }
}