CVE-2023-54393 PocketMine-MP before 4.20.5 Denial of Service via LoginPacket
High 8.7
Published
Updated
Check this codebase for CVE-2023-54393 and fix it if it is affected.
What it is: CVE-2023-54393 is a high-severity vulnerability in pmmp PocketMine-MP, published on 9 Sep 2026.
Exploitation: There is no known exploitation of CVE-2023-54393 in the wild and no public exploit code.
Affected packages and fixed versions:
- pocketmine/pocketmine-mp (Packagist): affected all versions; fixed in 4.20.5
- pocketmine/pocketmine-mp (Packagist): affected all versions; fixed in 4.20.5
- pocketmine/pocketmine-mp (Packagist): affected from 4.21.0; fixed in 4.21.1
- pocketmine/pocketmine-mp (Packagist): affected from 4.21.0; fixed in 4.21.1
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2023-54393/ (Markdown: https://insights.sbomify.com/CVE-2023-54393/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2023-54393?
CVE-2023-54393 is a high-severity vulnerability in pmmp PocketMine-MP, published on 9 Sep 2026.
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.
Weakness: CWE-20
Which versions are affected by CVE-2023-54393?
4 open source packages ship an affected version, including pocketmine/pocketmine-mp.
| Package | Affected | Fixed in |
|---|---|---|
pocketmine/pocketmine-mp Packagist | All versions | 4.20.5 |
pocketmine/pocketmine-mp Packagist | All versions | 4.20.5 |
pocketmine/pocketmine-mp Packagist | From 4.21.0 | 4.21.1 |
pocketmine/pocketmine-mp Packagist | From 4.21.0 | 4.21.1 |
How do I fix CVE-2023-54393?
Upgrade pocketmine/pocketmine-mp to a fixed version for your release line: 4.20.5 or 4.21.1.
Is CVE-2023-54393 being exploited?
There is no known exploitation of CVE-2023-54393 in the wild and no public exploit code.
Sources
Also known as GHSA-ghgx-426v-hj74, GHSA-pqp3-8rrw-g8vm.