What is CVE-2026-86200?

CVE-2026-86200 is a medium-severity vulnerability in Pmmp Pocketmine-Mp, classified under CWE-779. CVSS score: 5.3/10. Published 2026-09-09.

How severe is CVE-2026-86200?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Pmmp Pocketmine-Mp

CVE-2026-86200

PocketMine-MP versions before 5.42.1 contain a denial of service vulnerability in the LoginPacket handler that allows remote attackers to flood warning messages by injecting numerous junk properties into the clientData JWT. Attackers can craft malicious login packets with excessive unknown properties to waste server CPU time and degrade performance.

Published 2026-09-09 · last modified 2026-10-08.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.006 (50.0th percentile), scored 2026-10-25.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Pmmp Pocketmine-Mp

Weakness classification (CWE)

CWE-779

References

github.com/pmmp/PocketMine-MP/security/advisories/GHSA-xp4f-g2cm-rhg7 (vendor-advisory)
github.com/pmmp/PocketMine-MP/commit/c1d4a813fb8c21bfd8b9affd040da864b794df71 (patch)
www.vulncheck.com/advisories/pocketmine-mp-before-5.42.1-logdos-via-loginpacket… (third-party-advisory)

Frequently asked questions

What is CVE-2026-86200?: CVE-2026-86200 is a medium-severity vulnerability in Pmmp Pocketmine-Mp, classified under CWE-779. CVSS score: 5.3/10. Published 2026-09-09.
How severe is CVE-2026-86200?: Medium severity. CVSS v3 base score is 5.3 out of 10.