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Not in CISA KEV
MEDIUM severity

Book page text, count, and author/title length is not limited in PocketMine-MPGHSA-p62j-hrxm-xcxf

MEDIUM

GHSA-p62j-hrxm-xcxf is a medium-severity (CVSS 6.5) Uncontrolled Resource Consumption vulnerability in pocketmine/pocketmine-mp. A fix is available for pocketmine/pocketmine-mp — see the affected versions and patch details below.

Also known asCVE-2022-51018
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Oct 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-p62j-hrxm-xcxf.

EPSS Exploitation Probability

via FIRST.org ↗
0.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs34th percentile — riskier than 34% of all scored CVEsHighest risk
0.00%0.31%0.61%0.92%0.4%0.4%Oct 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-p62j-hrxm-xcxf by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,386 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

2 pkgs affected
🐘pocketmine/pocketmine-mp🐘pocketmine/pocketmine-mp

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

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:

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistpocketmine/pocketmine-mpall versions3.26.5composer require pocketmine/pocketmine-mp:^3.26.5
🐘Packagistpocketmine/pocketmine-mp≥ 4.0.0&&< 4.0.54.0.5composer require pocketmine/pocketmine-mp:^4.0.5

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for pocketmine/pocketmine-mp, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update pocketmine/pocketmine-mp to 3.26.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-p62j-hrxm-xcxf is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

### 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
O3 Security · Impact-Aware SCA

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Book page text, count, and author/title length is not…