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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (36.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/pmmp/PocketMine-MP/security/advisories/GHSA-788v-5pfp-93ff (vendor-advisory)
- www.vulncheck.com/advisories/pocketmine-mp-before-5.39.2-denial-of-service-via-… (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.