What is GHSA-wjfq-88q2-r34j?

GHSA-wjfq-88q2-r34j is a security advisory published by GitHub Security Advisories with High severity. Unhandled exception when decoding form response JSON

Why does GHSA-wjfq-88q2-r34j have no CVE ID yet?

GitHub Security Advisories published this advisory directly to customers before NVD assigned a CVE ID. This is the embargo-window disclosure pattern — vendors notify customers on day 0; NVD's public record follows days to weeks later.

What is the CVSS v3 score of GHSA-wjfq-88q2-r34j?

GHSA-wjfq-88q2-r34j has a CVSS v3 base score of 7.5, published by GitHub Security Advisories.

Which products are affected by GHSA-wjfq-88q2-r34j?

GHSA-wjfq-88q2-r34j affects 1 product, including: composer/pocketmine/pocketmine-mp:\u003e= 4.0.0, \u003c 4.0.7.

GHSA-wjfq-88q2-r34jHighCVSS 7.5Disclosed before NVD

Unhandled exception when decoding form response JSON

Vendor

GitHub Security Advisories

Published

January 21, 2022

Last Modified

December 26, 2025

📋 Description

Impact

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.

Patches

56fe71d939c38fe14e18a31a673a9331bcc0e4ca

Workarounds

A plugin may handle DataPacketReceiveEvent, capture ModalFormResponsePacket and run the provided JSON through stupid_json_decode.

Note that this requires copying the body of the function to a plugin, since the function is currently private.

For more information

If you have any questions or comments about this advisory:

Email us at [email protected]

🎯 Affected products1

composer/pocketmine/pocketmine-mp:>= 4.0.0, < 4.0.7