CVE-2026-86201 json
PocketMine-MP before 5.41.1 LogDoS via LoginPacket clientData
published 2026-04-06 7 mo ago modified 2026-10-08 31 d ago also GHSA-h6rj-3m53-887h , EUVD-2026-74912
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 49%
- public exploits
- 0
- none known
Summary
PocketMine-MP before 5.41.1 contains a denial of service vulnerability in LoginPacket processing where large or complex structures in unknown clientData JWT properties cause excessive logging without sanitization. Attackers can send crafted LoginPackets with deeply nested or massive object structures to trigger out-of-memory conditions and crash the server.
Patch / fix
- packagist pocketmine/pocketmine-mp 5.41.1
- pmmp PocketMine-MP 5.41.1
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 55 d ago
Exploit prediction
0.61% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-h6rj-3m53-887h referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.7 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| CNA | 4.0 | 8.7 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | pocketmine/pocketmine-mp | <5.41.1 |
5.41.1 |
Affected products
- pmmp PocketMine-MP
Classification
- Weakness
-
- CWE-400 Uncontrolled Resource Consumption
References
-
github.com
/pmmp/PocketMine-MP/commit/87d1c0cea09d972fd4c2fafb84dac2ecab7649f0
patch, web
-
github.com
/pmmp/PocketMine-MP/security/advisories/GHSA-h6rj-3m53-887h
vendor-advisory, exploit, web
-
vulncheck.com
/advisories/pocketmine-mp-before-5.41.1-logdos-via-loginpacket-clientdata
third-party-advisory
-
github.com
/pmmp/PocketMine-MP
package
-
github.com
/pmmp/PocketMine-MP/blob/5.41.0/src/network/mcpe/handler/LoginPacketHandler.php#L288-L302
web
-
github.com
/pmmp/PocketMine-MP/blob/5.41.0/src/network/mcpe/handler/LoginPacketHandler.php#L333-L349
web
Sources
- CVE List CVE-2026-86201
- GitHub Advisory GHSA-h6rj-3m53-887h
- NVD CVE-2026-86201
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.