Quick answers
- Is CVE-2026-86199 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-86199 being exploited in the wild.
- How severe is CVE-2026-86199?
- High severity, with a CVSS score of 7.5, published 9 September 2026.
- Which products and versions are affected?
- PocketMine PocketMine-MP before 5.43.1.
- Is there a fix for CVE-2026-86199?
- A patch was published on 2026-05-09: Fix released in version 5.43.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-86199 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-86199?
- Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is an uninitialized property access flaw in the offline login authentication mechanism. When processing login requests, the server fails to validate the Certificate field before accessing it, leading to a crash when the field is missing or malformed. The attack requires no authentication and is reachable over the network by any client attempting to connect. An attacker can trigger a denial-of-service condition by sending a crafted login packet with an invalid or missing certificate. The issue is fixed in version 5.43.1 and later.
Affected products
- PocketMine PocketMine-MP before 5.43.1
Timeline
- 2026-09-09: disclosed
- 2026-05-09: patched: Fix released in version 5.43.1