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Advisory record · GHSA-92jh-gwch-jq38

PocketMine-MP server crash with certain invalid JSON payloads in `LoginPacket` due to dependency vulnerability (again)

CVSS 8.7 HighEPSS 0.0061 · 49th percentile

Published by the GitHub Advisory Database at 14 Sept 2023, 17:10 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
pocketmine/pocketmine-mpPackagist>=5.0.0, <5.3.1 || <4.23.15.3.1, 4.23.1
Identifiers
GHSA-92jh-gwch-jq38 · CVE-2023-54390 · PKSA-nv2r-zxzd-wzsw
Weakness (CWE)
CWE-1025
Tags
Published
14 Sept 2023
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

PocketMine-MP versions below 4.23.1 and from 5.0.0 up to (but not including) 5.3.1 are affected. A remote attacker can crash the server by sending a LoginPacket containing malformed JSON, because the JSON mapper accepts NULL values in typed arrays that the server does not expect. Upgrade to 4.23.1 or 5.3.1, which include an updated JsonMapper fix; the source notes that a plugin-based workaround exists but is cumbersome.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.7 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0061, the 49th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:56 UTC First seen by agentprime
  2. 31 Oct 2026, 13:56 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.