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A GitHub-reviewed security advisory, not necessarily under active exploitation the way our CISA KEV advisories are, but a real, disclosed vulnerability in an open-source dependency.
Affected packages
Vulnerable: < 5.44.2
Patched in 5.44.2
Details
During the resource pack stage of logging in, after the server sends ResourcePackStackPacket, a malicious client can send a batch of multiple ResourcePackClientResponsePacket packets with status ResourcePackClientResponsePacket::STATUS_COMPLETED causing the server to repeatedly execute pre-spawn progression.
Multiple Player objects can be created for just a single session, increasing memory usage and amplifying outbound network traffic from duplication of large pre-spawn packets such as AvailableCommandsPacket and CreativeContentPacket.
Plugins can use their own PacketHandler classes that reject/ignore any extra ResourcePackClientResponsePacket packets.
This issue was patched in https://github.com/pmmp/PocketMine-MP/commit/7a27894146a04964ab628ed9033140fdbf887ff3 and released in 5.44.2.
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A secure code review or supply chain review finds this before an advisory does.