High severity · published Sep 9, 2026
CVE-2026-86199
PocketMine-MP before 5.43.1 Denial of Service via unauthenticated login
7.5
CVSS
0.5%
EPSS
No
On KEV
Description
PocketMine-MP versions before 5.43.1 fail to properly validate the Certificate field during offline login authentication. Unauthenticated players can trigger an uninitialized property access error that crashes 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)0.5% · higher than 40% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PO
PocketMine-MP · pmmp
before 5.43.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-86199
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-86199
github.com
https://github.com/pmmp/PocketMine-MP/commit/8c75a1d739e8e190d3cc2338b25cebcc9c052b1b
github.com
https://github.com/pmmp/PocketMine-MP/commit/e4aaef4ee0f769b52dc0347a1d6da403b9691115
github.com
https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-g2fj-p69p-9chp
www.vulncheck.com
https://www.vulncheck.com/advisories/pocketmine-mp-before-5.43.1-denial-of-service-via-unauthenticated-login
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