vulnerability / NVI-00007449 / Revision 4
Book page text, count, and author/title length is not limited in PocketMine-MP
OSV carries this publisher advisory for pocketmine/pocketmine-mp, pocketmine/pocketmine-mp. This is an aggregated source copy; consult the original publisher and compare update dates.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
6.5 MEDIUM (3.1)
disclosure@vulncheck.com severity; no combined Null risk score.
7.1 HIGH (4.0)
disclosure@vulncheck.com severity; no combined Null risk score.
0.436%
FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.37859. Missing scores are unknown.
As of · FIRST EPSS
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
pocketmine/pocketmine-mp
source listedECOSYSTEM: introduced 0; fixed 3.26.5
### Impact Players can fill book pages with as many characters as they like; the server does not check this. In addition, the maximum of 50 pages is also not enforced, meaning that players can create "book bombs". This causes a variety of problems: - Oversized NBT on the wire costing excess bandwidth for server and client - Server crashes when saving region-based worlds due to exceeding maximum chunk size of 1 MB (PM3-specific) - Server crashes if any book page exceeds 32 KiB (due to TAG_String size limit) (PM4-specific) This does, however, require that an attacker obtain a writable book in the first place in order to exploit the problem. ### Patches The bug has been fixed in 3.26.5 and 4.0.5. ### Workarounds Ban writable books, or use a plugin to cancel `PlayerEditBookEvent` to cancel the event if `strlen(text) > 1024 || mb_strlen(text) > 256`. ### For more information If you have any questions or comments about this advisory: * Email us at team@pmmp.io
pocketmine/pocketmine-mp
source listedECOSYSTEM: introduced 4.0.0; fixed 4.0.5
### Impact Players can fill book pages with as many characters as they like; the server does not check this. In addition, the maximum of 50 pages is also not enforced, meaning that players can create "book bombs". This causes a variety of problems: - Oversized NBT on the wire costing excess bandwidth for server and client - Server crashes when saving region-based worlds due to exceeding maximum chunk size of 1 MB (PM3-specific) - Server crashes if any book page exceeds 32 KiB (due to TAG_String size limit) (PM4-specific) This does, however, require that an attacker obtain a writable book in the first place in order to exploit the problem. ### Patches The bug has been fixed in 3.26.5 and 4.0.5. ### Workarounds Ban writable books, or use a plugin to cancel `PlayerEditBookEvent` to cancel the event if `strlen(text) > 1024 || mb_strlen(text) > 256`. ### For more information If you have any questions or comments about this advisory: * Email us at team@pmmp.io
03 / Response
What to do next
- vendor patch
The original advisory lists fixed boundaries 3.26.5 for pocketmine/pocketmine-mp. Confirm the publisher’s latest guidance.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database via OSV
- vendor patch
The original advisory lists fixed boundaries 4.0.5 for pocketmine/pocketmine-mp. Confirm the publisher’s latest guidance.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database via OSV
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. FIRST EPSS
A fixed release is not deployment evidence.
Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
- NVD lastModified does not establish freshness of every associated CPE record.
05 / Provenance
Sources you can inspect
Each assertion retains its source. Mirrored records may repeat one underlying publisher; additional links are not independent corroboration.
- GHSA-p62j-hrxm-xcxf ↗
GitHub Advisory Database via OSV · vendor advisory
Observed . GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.
- CVE-2022-51018 ↗
NIST National Vulnerability Database · official catalog
Observed . This product uses data from the NVD API but is not endorsed or certified by the NVD.
- CVE-2022-51018 ↗
FIRST EPSS · official catalog
Observed . FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.
Public revision history
Only published revisions appear here. Routine fetches do not create a material-change event.
- Revision 4 ·
Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.
- Revision 3 ·
Source facts changed; compare the preserved prior revision.
- Revision 2 ·
Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.
- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.