High severity · published Sep 9, 2026
CVE-2026-86201
PocketMine-MP before 5.41.1 LogDoS via LoginPacket clientData
7.5
CVSS
0.6%
EPSS
No
On KEV
Description
PocketMine-MP before 5.41.1 contains a denial of service vulnerability in LoginPacket processing where large or complex structures in unknown clientData JWT properties cause excessive logging without sanitization. Attackers can send crafted LoginPackets with deeply nested or massive object structures to trigger out-of-memory conditions and crash the server.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 49% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PO
PocketMine-MP · pmmp
before 5.41.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-86201
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-86201
vendor-advisory
https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-h6rj-3m53-887h
patch
https://github.com/pmmp/PocketMine-MP/commit/87d1c0cea09d972fd4c2fafb84dac2ecab7649f0
third-party-advisory
https://www.vulncheck.com/advisories/pocketmine-mp-before-5.41.1-logdos-via-loginpacket-clientdata
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