CVE-2026-86200 json
PocketMine-MP before 5.42.1 LogDoS via LoginPacket clientData JWT
published 6mo ago modified last mo. also GHSA-xp4f-g2cm-rhg7 , EUVD-2026-74911
- cvss
- 5.3
- 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 51%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- packagist pocketmine/pocketmine-mp 5.42.1
- pmmp PocketMine-MP 5.42.1
Is CVE-2026-86200 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- last mo.
Exploit prediction
0.64% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.9 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N |
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| CNA | 4.0 | 6.9 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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 |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | pocketmine/pocketmine-mp | <5.42.1 |
5.42.1 |
Affected products
- pmmp PocketMine-MP
Classification
- Weakness
-
- CWE-779 Logging of Excessive Data
References
-
github.com
/pmmp/PocketMine-MP/commit/c1d4a813fb8c21bfd8b9affd040da864b794df71
patch, web
-
github.com
/pmmp/PocketMine-MP/security/advisories/GHSA-xp4f-g2cm-rhg7
vendor-advisory, web
-
vulncheck.com
/advisories/pocketmine-mp-before-5.42.1-logdos-via-loginpacket-clientdata-jwt
third-party-advisory
-
github.com
/pmmp/PocketMine-MP
package
-
github.com
/pmmp/PocketMine-MP/blob/5.41.1/src/network/mcpe/handler/LoginPacketHandler.php#L289-L303
web
-
github.com
/pmmp/PocketMine-MP/blob/5.41.1/src/network/mcpe/handler/LoginPacketHandler.php#L334-L350
web
Sources
- CVE List CVE-2026-86200
- GitHub Advisory GHSA-xp4f-g2cm-rhg7
- NVD CVE-2026-86200
Fencer Intel 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.