GHSA-wjfq-88q2-r34j: Unhandled exception when decoding form response JSON

January 21, 2022 (updated December 26, 2025)

When handling form responses from the client (ModalFormResponsePacket), the Minecraft Windows client may send weird JSON that json_decode() can’t understand. A workaround for this is implemented in InGamePacketHandler::stupid_json_decode().

An InvalidArgumentException is thrown by this function when it fails to fix an error found in the JSON, which is not caught by the caller. This leads to a server crash.

References

github.com/advisories/GHSA-wjfq-88q2-r34j
github.com/pmmp/PocketMine-MP
github.com/pmmp/PocketMine-MP/blob/4.0.7/changelogs/4.0.md
github.com/pmmp/PocketMine-MP/commit/56fe71d939c38fe14e18a31a673a9331bcc0e4ca
github.com/pmmp/PocketMine-MP/security/advisories/GHSA-wjfq-88q2-r34j

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