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Not in CISA KEV
HIGH severity

PocketMine-MP has improperly handled dye colour IDs in banner NBT, leading to server crashGHSA-wqqv-jcfr-9f5g

HIGHFix: pmmp/PocketMine-MP@08b9495

GHSA-wqqv-jcfr-9f5g is a high-severity (CVSS 7.5) CWE-129 vulnerability in pocketmine/pocketmine-mp. A fix is available for pocketmine/pocketmine-mp — see the affected versions and patch details below.

Also known asCVE-2023-54396
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-wqqv-jcfr-9f5g.

EPSS Exploitation Probability

via FIRST.org ↗
0.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs45th percentile — riskier than 45% of all scored CVEsHighest risk
0.03%0.36%0.70%1.03%0.5%0.5%Nov 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘pocketmine/pocketmine-mp

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Impact

DyeColorIdMap->fromId() did not account for the possibility that it might be given invalid input. This means that an undefined offset error would occur whenever this happened.

This code is indirectly called during Banner->deserializeCompoundTag(), which is invoked when deserializing any item NBT, whether from network or disk.

An attacker could use this bug to crash a server by providing NBT with invalid values for pattern colours in an inventory transaction, or by using /give to obtain an item with NBT like this.

Patches

08b9495bce2d65a6d1d3eeb76e484499a00765eb

Workarounds

This is quite difficult to work around via a plugin. Theoretically, it's possible to override the Banner item class from a plugin and validate the data before it reaches deserializeCompoundTag().

For more information

If you have any questions or comments about this advisory:

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistpocketmine/pocketmine-mpall versions4.8.1composer require pocketmine/pocketmine-mp:^4.8.1

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for pocketmine/pocketmine-mp, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update pocketmine/pocketmine-mp to 4.8.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-wqqv-jcfr-9f5g is resolved across your whole dependency graph.

  3. Workarounds

    Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade.

Frequently Asked Questions

### Impact `DyeColorIdMap->fromId()` did not account for the possibility that it might be given invalid input. This means that an undefined offset error would occur whenever this happened. This code is indirectly called during [`Banner->deserializeCompoundTag()`](https://github.com/pmmp/PocketMine-MP/blob/38d6284671e8b657ba557e765a6c29b24a7705f5/src/item/Banner.php#L104), which is invoked when deserializing any item NBT, whether from network or disk. An attacker could use this bug to crash a server by providing NBT with invalid values for pattern colours in an inventory transaction, or by us
O3 Security · Impact-Aware SCA

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