Unhandled exception when decoding form response JSON
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
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- Confidentiality · integrity · availability
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- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub.
Summary
### 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]](mailto:[email protected])
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | pocketmine/pocketmine-mp (Packagist) | 4.0.0 to before 4.0.7 | 4.0.7 | Patch available | GHSA-wjfq-88q2-r34j |
- pocketmine/pocketmine-mp (Packagist) Vendor— Affected 4.0.0 to before 4.0.7 Fixed in 4.0.7 Patch available GHSA-wjfq-88q2-r34j
Remediation
- Fix · GHSA-wjfq-88q2-r34j pocketmine/pocketmine-mp (Packagist) Fixed in 4.0.7 Advisory →
Timeline
- 2026-10-03 Threatist record created from GHSA-wjfq-88q2-r34j
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences