Vulnerability · Published Sep 9, 2026 · Assigned by VulnCheck
CVE-2023-54393PocketMine-MP before 4.20.5 Denial of Service via LoginPacket
High 7.5
In plain English
A high-severity improper input validation in PocketMine-MP from pmmp. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.6%top 49.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
PocketMine-MP versions before 4.20.5 contain a denial of service vulnerability in LoginPacket JSON parsing due to improper validation in the JsonMapper dependency. Attackers can send malformed JSON structures in LoginPacket to crash the server.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | pocketmine/pocketmine-mp | 4.20.5 | GHSA-pqp3-8rrw-g8vm |
| Packagist | pocketmine/pocketmine-mp | 4.21.1 | GHSA-pqp3-8rrw-g8vm |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| pmmp | PocketMine-MP | 0 – before 4.20.54.21.0 – before 4.21.1 |
Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- GitHub Security Advisory (GHSA-pqp3-8rrw-g8vm) vendor-advisory
- Patch Commit patch
- Patch Commit patch
- VulnCheck Advisory: PocketMine-MP before 4.20.5 Denial of Service via LoginPacket third-party-advisory