What is CVE-2026-86199?

CVE-2026-86199 is a high-severity vulnerability in Pmmp Pocketmine-Mp, classified under Incomplete List of Disallowed Inputs. CVSS score: 7.5/10. Published 2026-09-09.

How severe is CVE-2026-86199?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Pmmp Pocketmine-Mp

CVE-2026-86199

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.

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

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.005 (39.5th percentile), scored 2026-10-25.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Pmmp Pocketmine-Mp

Weakness classification (CWE)

CWE-184 — Incomplete List of Disallowed Inputs

References

github.com/pmmp/PocketMine-MP/security/advisories/GHSA-g2fj-p69p-9chp (vendor-advisory)
github.com/pmmp/PocketMine-MP/commit/e4aaef4ee0f769b52dc0347a1d6da403b9691115 (patch)
github.com/pmmp/PocketMine-MP/commit/8c75a1d739e8e190d3cc2338b25cebcc9c052b1b (patch)
www.vulncheck.com/advisories/pocketmine-mp-before-5.43.1-denial-of-service-via-… (third-party-advisory)

Frequently asked questions

What is CVE-2026-86199?: CVE-2026-86199 is a high-severity vulnerability in Pmmp Pocketmine-Mp, classified under Incomplete List of Disallowed Inputs. CVSS score: 7.5/10. Published 2026-09-09.
How severe is CVE-2026-86199?: High severity. CVSS v3 base score is 7.5 out of 10.