# CVE-2023-54395: PocketMine-MP denial-of-service in ModalFormResponsePacket processing

Source: https://junglewise.ai/threats/cve-2023-54395-pocketmine-mp-denial-of-service-in-modalformresponsepacket  
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-2023-54395 · Severity: medium · CVSS 4.3 · Published 2026-09-09

PocketMine-MP is a popular server software for Minecraft: Pocket Edition. A flaw in how the server handles modal form response packets allows attackers to send large JSON payloads that consume excessive CPU resources, preventing the server from responding to legitimate player connections and causing service outages.

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-2023-54395 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2023-54395 being exploited in the wild.

**How severe is CVE-2023-54395?** Medium severity, with a CVSS score of 4.3, published 9 September 2026.

**Which products and versions are affected?** pocketmine/pocketmine-mp (Packagist) ECOSYSTEM:introduced=0,fixed=4.12.5.

**Is there a fix for CVE-2023-54395?** Yes. pocketmine/pocketmine-mp (Packagist): upgrade to 4.12.5 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2023-54395 attacked?** It is attacked over the network.

**Am I affected by CVE-2023-54395?** 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 4.12.5 or later

  ```sh
  composer require pocketmine/pocketmine-mp:^4.12.5
  ```


## Technical details

The vulnerability is an algorithmic complexity issue (CWE-407) in ModalFormResponsePacket processing. The server contained a workaround for an old client bug that caused it to spend significant time parsing very large JSON payloads in modal form responses. An attacker with network access and low privileges (connected to the server) can send numerous oversized packets to exhaust CPU resources and prevent timely processing of other connections. The vulnerability was patched in version 4.12.5 by removing the inefficient workaround code (commit 3baa5ab). No user interaction is required; the attack occurs purely through malicious packet transmission.

## Affected products

- PocketMine PocketMine-MP before 4.12.5

## Identifiers

- CVE-2023-54395
- GHSA-7m9r-rq9j-wmmh

## Timeline

- 2023-01-09: disclosed: GitHub advisory GHSA-7m9r-rq9j-wmmh published
- 2023-01-09: patched: Fix released in version 4.12.5 (commit 3baa5ab)

## References

- [https://github.com/pmmp/PocketMine-MP/commit/3baa5ab71214f96e6e7ab12cb9beef08118473b5](https://github.com/pmmp/PocketMine-MP/commit/3baa5ab71214f96e6e7ab12cb9beef08118473b5)
- [https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-7m9r-rq9j-wmmh](https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-7m9r-rq9j-wmmh)

## 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)