# CVE-2026-86198: PocketMine-MP improper validation of ResourcePackClientResponsePacket

Source: https://junglewise.ai/threats/cve-2026-86198-pocketmine-mp-improper-validation-of  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-09. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-86198 · Severity: medium · CVSS 4.2 · Published 2026-09-09

PocketMine-MP is a PHP-based server software for Minecraft: Bedrock Edition. During player login, a malicious client can send multiple duplicate resource pack completion packets to cause the server to create duplicate player objects, consuming excessive memory and bandwidth. This can degrade server performance and availability.

Technologies: [pocketmine/pocketmine-mp (Packagist)](https://junglewise.ai/threats/technologies/pocketmine-pocketmine-mp). Vendors: [Packagist](https://junglewise.ai/threats/vendors/packagist).

## Quick answers

**Is CVE-2026-86198 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-86198 being exploited in the wild.

**How severe is CVE-2026-86198?** Medium severity, with a CVSS score of 4.2, published 9 September 2026.

**Which products and versions are affected?** pocketmine/pocketmine-mp (Packagist) ECOSYSTEM:introduced=0,fixed=5.44.2.

**Is there a fix for CVE-2026-86198?** Yes. pocketmine/pocketmine-mp (Packagist): upgrade to 5.44.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-86198 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-86198?** Check whether you run pocketmine/pocketmine-mp (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- pocketmine/pocketmine-mp (Packagist): upgrade to 5.44.2 or later

  ```sh
  composer require pocketmine/pocketmine-mp:^5.44.2
  ```


## Technical details

The vulnerability is an improper validation issue in the ResourcePackClientResponsePacket STATUS_COMPLETED handler within the ResourcePacksPacketHandler class. When a client sends multiple ResourcePackClientResponsePacket packets with STATUS_COMPLETED status during the resource pack handshake phase, the handler fails to prevent repeated pre-spawn progression, allowing duplicate Player objects to be created from a single session. Attack vector is network-based with low attack complexity and low privileges required. An attacker can send batches of these packets to amplify memory consumption and outbound network traffic through duplication of large pre-spawn packets. The fix, released in version 5.44.2 (commit 7a27894), adds a check to prevent re-execution by clearing the handler after completion.

## Affected products

- PocketMine PocketMine-MP before 5.44.2

## Identifiers

- CVE-2026-86198
- GHSA-pg53-p7qp-65cv

## Timeline

- 2026-06-24: disclosed
- 2026-09-09: patched: version 5.44.2 released

## References

- [https://github.com/pmmp/PocketMine-MP/commit/7a27894146a04964ab628ed9033140fdbf887ff3](https://github.com/pmmp/PocketMine-MP/commit/7a27894146a04964ab628ed9033140fdbf887ff3)
- [https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-pg53-p7qp-65cv](https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-pg53-p7qp-65cv)

## Related threats

- [PocketMine-MP denial of service in ModalFormResponsePacket handling](https://junglewise.ai/threats/cve-2026-86204-pocketmine-mp-denial-of-service-in-modalformresponsepacket)
- [PocketMine-MP item duplication via despawn entity attack race condition](https://junglewise.ai/threats/cve-2026-86203-pocketmine-mp-item-duplication-via-despawn-entity-attack-race)
- [PocketMine-MP network amplification in ActorEventPacket](https://junglewise.ai/threats/cve-2026-86202-pocketmine-mp-network-amplification-in-actoreventpacket)
- [PocketMine-MP denial of service in LoginPacket processing](https://junglewise.ai/threats/cve-2026-86201-pocketmine-mp-denial-of-service-in-loginpacket-processing)
- [PocketMine-MP denial of service in LoginPacket handler](https://junglewise.ai/threats/cve-2026-86200-pocketmine-mp-denial-of-service-in-loginpacket-handler)