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Vulnerability record · CVE-2026-86204 · published 9 September 2026

CVE-2026-86204: Uncontrolled resource consumption vulnerability

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.

7.1 CVSS 4.0 High EPSS 0.44% · top 64.7% CWE-400 · Uncontrolled resource consumption Deferred
7.1CVSS 4.0 base score
0.44%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
9 Sep 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-788v-5pfp-93ff
https://www.vulncheck.com/advisories/pocketmine-mp-before-5.39.2-denial-of-service-via-modalformresponsepacket
https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-788v-5pfp-93ff

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Source: NIST National Vulnerability Database (record CVE-2026-86204), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.