How severe is GHSA-h6j3-j35f-v2x7?

GHSA-h6j3-j35f-v2x7 has a CVSS score of 7.5/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by GHSA-h6j3-j35f-v2x7?

GHSA-h6j3-j35f-v2x7 affects the following packages: pocketmine/pocketmine-mp (Packagist). Ecosystems affected: Packagist.

How do I fix GHSA-h6j3-j35f-v2x7?

Update pocketmine/pocketmine-mp to 5.11.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-h6j3-j35f-v2x7 is resolved across your whole dependency graph.

How do I detect GHSA-h6j3-j35f-v2x7 in my Packagist dependencies?

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.

How do I mitigate GHSA-h6j3-j35f-v2x7 if there is no patch (or I can't update yet)?

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.

Is GHSA-h6j3-j35f-v2x7 actively exploited in the wild?

No public exploit code has been indexed for GHSA-h6j3-j35f-v2x7 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for GHSA-h6j3-j35f-v2x7?

GHSA-h6j3-j35f-v2x7 has an EPSS (Exploit Prediction Scoring System) score of 0.8%, placing it in the 56th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-h6j3-j35f-v2x7?

GHSA-h6j3-j35f-v2x7 is classified as Deserialization of Untrusted Data (CWE-502). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was GHSA-h6j3-j35f-v2x7 published, and has it been updated?

GHSA-h6j3-j35f-v2x7 was published on March 6, 2024 and was last updated on September 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘

🐘 Packagist

Not in CISA KEV

HIGH severity

PocketMine-MP server crash with certain invalid JSON payloads in `LoginPacket` due to dependency vulnerability (3rd time)GHSA-h6j3-j35f-v2x7

HIGHFix: cweiske/jsonmapper#225

GHSA-h6j3-j35f-v2x7 is a high-severity (CVSS 7.5) Deserialization of Untrusted Data vulnerability in pocketmine/pocketmine-mp. A fix is available for pocketmine/pocketmine-mp — see the affected versions and patch details below.

Also known asCVE-2024-58381

Published

Mar 6, 2024

Updated

Sep 10, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
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-h6j3-j35f-v2x7.

EPSS Exploitation Probability

via FIRST.org ↗

0.8%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs56th percentile — riskier than 56% of all scored CVEsHighest risk

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

An attacker could crash PocketMine-MP by sending malformed JSON in LoginPacket.

netresearch/jsonmapper allows objects to be hydrated from scalar types in JSON. However, due to the lack of validation in the code for this feature, it may output improperly initialized objects if applied to objects whose constructors don't handle the input values.

Code handling these objects in PocketMine-MP could then crash due to @required properties not being set within the objects.

In addition, because JsonMapper does not respect bStrictObjectTypes when processing arrays, it's not possible to avoid the issue by disabling the feature.

Due to the relatively high number of security issues arising from unexpected behaviour in JsonMapper, the team is exploring options to replace it.

Patches

In the meantime, the issue was fixed by pmmp/netresearch-jsonmapper@b96a209f9e8b76b899a0d0918493cd87eb3c02a7 and 6872661fd03649cc7a8762c41c16e9ee5a4de1c9.

Workarounds

Detecting the malicious data that triggers this issue is of rather high difficulty, so it's not likely that a plugin would be able to easily remediate this.

References

https://github.com/cweiske/jsonmapper/pull/225 https://github.com/cweiske/jsonmapper/issues/226

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`pocketmine/pocketmine-mp`	all versions	5.11.1`composer require pocketmine/pocketmine-mp:^5.11.1`

Detection & mitigation playbook

Open-source dependency

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.
Fix
Update pocketmine/pocketmine-mp to 5.11.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-h6j3-j35f-v2x7 is resolved across your whole dependency graph.
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 An attacker could crash PocketMine-MP by sending malformed JSON in LoginPacket. [netresearch/jsonmapper](https://github.com/cweiske/JsonMapper) allows objects to be hydrated from scalar types in JSON. However, due to the lack of validation in the code for this feature, it may output improperly initialized objects if applied to objects whose constructors don't handle the input values. Code handling these objects in PocketMine-MP could then crash due to `@required` properties not being set within the objects. In addition, because JsonMapper does not respect `bStrictObjectTypes` whe