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High, CVSS 7.5

Insufficient type validation in pocketmine/pocketmine-mp

GHSA-g5rr-p69h-7v3g

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (pocketmine/pocketmine-mp 4.2.9), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

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

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-g5rr-p69h-7v3g

Agent brief

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# Patch Next advisory brief: GHSA-g5rr-p69h-7v3g

Advisory: Insufficient type validation in pocketmine/pocketmine-mp
IDs: GHSA-g5rr-p69h-7v3g
Record: https://patchnext.com/advisories/ghsa-g5rr-p69h-7v3g (revision 1, source checked 26 Oct 2026, 14:35 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
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 4.2.9. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist pocketmine/pocketmine-mp: affected < 4.2.9; fixed in 4.2.9

## 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-g5rr-p69h-7v3g (GitHub-reviewed advisory GHSA-g5rr-p69h-7v3g lists affected ranges: Packagist pocketmine/pocketmine-mp >=0 <4.2.9)

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