PocketMine-MP before 3.26.5 and 4.0.5 Input Validation via Book Pages (CVE-2022-51018) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2022-51018

PocketMine-MP before 3.26.5 and 4.0.5 Input Validation via Book Pages

Answer in brief

CVE-2022-51018 records a Unknown severity vulnerability in PocketMine-MP before 3.26.5 and 4.0.5 Input Validation via Book Pages. The current sources do not mark it as known exploited. The current feed maps pmmp/PocketMine-MP (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 7, 2026Updated Sep 8, 2026Source checked Sep 8, 2026First seen by HOL Sep 7, 2026Material review Sep 8, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps pmmp/PocketMine-MP (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
pmmp/PocketMine-MPgeneric	>=3.0.0 <3.26.5 \|\| >=4.0.0 <4.0.5	3.26.5, 4.0.5

Recommended response

Check inventory. Check lockfiles and deployed manifests for pmmp/PocketMine-MP.
Review the reported fix. Update pmmp/PocketMine-MP to 3.26.5 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 7, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 7, 2026

Sources and claim methodology

Upstream source 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).

Quoted source text, attributed separately from HOL analysis.