Login Request a demo
Medium severity · published Sep 9, 2026
CVE-2026-86204
PocketMine-MP before 5.39.2 Denial of Service via ModalFormResponsePacket
6.5
CVSS
0.4%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 38% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PO
PocketMine-MP · pmmp
before 5.39.2 · source: vendor
Affected product
PO
PocketMine-MP
pmmp
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-86204
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-86204
vendor-advisory
https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-788v-5pfp-93ff
third-party-advisory
https://www.vulncheck.com/advisories/pocketmine-mp-before-5.39.2-denial-of-service-via-modalformresponsepacket
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