Denial of Service Vulnerability in PocketMine-MP by PocketMine
CVE-2026-86204

7.1HIGH

Key Information:

Vendor

Pmmp

Status
Pocketmine-mp
Vendor
CVE Published:
9 September 2026

What is CVE-2026-86204?

PocketMine-MP versions earlier than 5.39.2 are vulnerable to denial of service attacks due to inadequate restrictions on JSON payload sizes in ModalFormResponsePacket processing. Authenticated users can exploit this flaw by sending excessively large JSON arrays as modal form responses, which can deplete server memory and CPU resources. This can result in the server becoming unresponsive, severely affecting gameplay and server performance.

Affected Version(s)

PocketMine-MP 0 < 5.39.2

PocketMine-MP 5.39.2

References

https://github.com/pmmp/PocketMine-MP/security/advisories...
vendor-advisory
https://www.vulncheck.com/advisories/pocketmine-mp-before...
third-party-advisory

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Zwuiix-cmd
dktapps
.