CVE-2026-86199 PocketMine-MP before 5.43.1 Denial of Service via unauthenticated login
Unauthenticated attackers can crash the PocketMine-MP server by sending malformed login packets, requiring an upgrade to restore service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-86199?
CVE-2026-86199 is a high-severity denial of service vulnerability in pmmp PocketMine-MP, published on 9 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-184
Which versions are affected by CVE-2026-86199?
How do I fix CVE-2026-86199?
No fix has been published for CVE-2026-86199 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-86199 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86199 exists.
Sources
Also known as GHSA-g2fj-p69p-9chp, GHSA-vmpr-x88w-pmm6.