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High, CVSS 7.5

PocketMine-MP BookEditPacket crash when inventory slot in the packet is invalid

GHSA-xc7j-wj36-qjfr

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (pocketmine/pocketmine-mp 5.11.2), 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.

Summary If a client sends a BookEditPacket with InventorySlot greater than 35, the server will crash due to an unhandled exception thrown by BaseInventory-getItem(). Details Crashes at https://github.com/pmmp/PocketMine-MP/blob/b744e09352a714d89220719ab6948a010ac636fc/src/network/mcpe/handler/InGamePacketHandler.php#L873 PoC Using Gophertunnel, use serverConn.WritePacket(&packet.BookEdit{InventorySlot: 36}) Impact Server crash, all servers Patched versions This issue was fixed by 47f011966092f275cc1b11f8de635e89fd9651a7, and the fix was released in 5.11.2.

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

    Published from ghsa record GHSA-xc7j-wj36-qjfr

Agent brief

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# Patch Next advisory brief: GHSA-xc7j-wj36-qjfr

Advisory: PocketMine-MP BookEditPacket crash when inventory slot in the packet is invalid
IDs: GHSA-xc7j-wj36-qjfr
Record: https://patchnext.com/advisories/ghsa-xc7j-wj36-qjfr (revision 1, source checked 26 Oct 2026, 14:18 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 5.11.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist pocketmine/pocketmine-mp: affected < 5.11.2; fixed in 5.11.2

## 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-xc7j-wj36-qjfr (GitHub-reviewed advisory GHSA-xc7j-wj36-qjfr lists affected ranges: Packagist pocketmine/pocketmine-mp >=0 <5.11.2)

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