What is CVE-2026-86204?

CVE-2026-86204 is a medium-severity vulnerability in Pmmp Pocketmine-Mp, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-09-09.

How severe is CVE-2026-86204?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Resource exhaustion in Pmmp Pocketmine-Mp

CVE-2026-86204

PocketMine-MP versions before 5.39.2 fail to limit JSON payload size in ModalFormResponsePacket handling, allowing authenticated players to cause denial of service. Attackers can send modal form response packets with massive JSON arrays to exhaust server memory and CPU resources, rendering the server unresponsive.

Vulnerability class: DoS (Denial of Service)

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Pmmp Pocketmine-mp

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-86204?: CVE-2026-86204 is a medium-severity vulnerability in Pmmp Pocketmine-Mp, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-09-09.
How severe is CVE-2026-86204?: Medium severity. CVSS v3 base score is 6.5 out of 10.