Medium severity · published Sep 7, 2026
CVE-2022-51018
PocketMine-MP before 3.26.5 and 4.0.5 Input Validation via Book Pages
6.5
CVSS
0.4%
EPSS
No
On KEV
Description
PocketMine-MP before 3.26.5 and 4.0.x before 4.0.5 does not limit book page text length, page count, or author/title length. A player who obtains a writable book can create oversized NBT ('book bombs'), causing excess bandwidth consumption and server crashes (exceeding the 1 MB chunk size limit when saving region-based worlds in PM3, or exceeding the 32 KiB TAG_String limit in PM4).
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 38% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PO
PocketMine-MP · pmmp
3.0.0 before 3.26.5; 4.0.0 before 4.0.5 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-51018
CVE.org
https://www.cve.org/CVERecord?id=CVE-2022-51018
vendor-advisory
https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-p62j-hrxm-xcxf
third-party-advisory
https://www.vulncheck.com/advisories/pocketmine-mp-before-3.26.5-input-validation-via-book-pages
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