{"id":"GHSA-p62j-hrxm-xcxf","aliases":["CVE-2022-51018"],"title":"Book page text, count, and author/title length is not limited in PocketMine-MP","description":"### Impact\nPlayers can fill book pages with as many characters as they like; the server does not check this.\nIn addition, the maximum of 50 pages is also not enforced, meaning that players can create \"book bombs\".\n\nThis causes a variety of problems:\n- Oversized NBT on the wire costing excess bandwidth for server and client\n- Server crashes when saving region-based worlds due to exceeding maximum chunk size of 1 MB (PM3-specific)\n- Server crashes if any book page exceeds 32 KiB (due to TAG_String size limit) (PM4-specific)\n\nThis does, however, require that an attacker obtain a writable book in the first place in order to exploit the problem.\n\n### Patches\nThe bug has been fixed in 3.26.5 and 4.0.5.\n\n### Workarounds\nBan writable books, or use a plugin to cancel `PlayerEditBookEvent` to cancel the event if `strlen(text) > 1024 || mb_strlen(text) > 256`.\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Email us at [team@pmmp.io](mailto:team@pmmp.io)\n","severity":"medium","score":6.5,"published":"2022-01-06T23:53:35.000Z","modified":"2026-09-08T12:38:05.325Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"pocketmine/pocketmine-mp","ranges":[{"events":[{"introduced":"0"},{"fixed":"3.26.5"}],"type":"ECOSYSTEM"}],"versions":["3.0.0","3.0.1","3.0.10","3.0.11","3.0.12","3.0.2","3.0.3","3.0.4","3.0.5","3.0.6","3.0.7","3.0.8","3.0.9","3.1.0","3.1.1","3.1.2","3.1.3","3.1.4","3.1.5","3.1.6","3.1.7","3.1.8","3.10.0","3.10.1","3.11.0","3.11.1","3.11.2","3.11.3","3.11.4","3.11.5","3.11.6","3.11.7","3.12.0","3.12.1","3.12.2","3.12.3","3.12.4","3.12.5","3.12.6","3.13.0","3.13.1","3.14.0","3.14.1","3.14.2","3.14.3","3.15.0","3.15.1","3.15.2","3.15.3","3.15.4","3.16.0","3.16.1","3.17.0","3.17.1","3.17.2","3.17.3","3.17.4","3.17.5","3.17.6","3.17.7","3.18.0","3.18.1","3.18.2","3.19.0","3.19.1","3.19.2","3.19.3","3.2.0","3.2.1","3.2.2","3.2.3","3.2.4","3.2.5","3.2.6","3.2.7","3.20.0","3.21.0","3.21.1","3.22.0","3.22.1","3.22.2","3.22.3","3.22.4","3.22.5","3.23.0","3.23.1","3.24.0","3.25.0","3.25.1","3.25.2","3.25.3","3.25.4","3.25.5","3.25.6","3.26.0","3.26.1","3.26.2","3.26.3","3.26.4","3.3.0","3.3.1","3.3.2","3.3.3","3.3.4","3.4.0","3.4.1","3.4.2","3.4.3","3.5.0","3.5.1","3.5.10","3.5.11","3.5.12","3.5.13","3.5.2","3.5.3","3.5.4","3.5.5","3.5.6","3.5.7","3.5.8","3.5.9","3.6.0","3.6.1","3.6.2","3.6.3","3.6.4","3.6.5","3.6.6","3.7.0","3.7.1","3.7.2","3.7.3","3.8.0","3.8.1","3.8.2","3.8.3","3.8.4","3.8.5","3.8.6","3.8.7","3.9.0","3.9.1","3.9.2","3.9.3","3.9.4","3.9.5","3.9.6","3.9.7","3.9.8"],"fixed":["3.26.5"]},{"ecosystem":"Packagist","name":"pocketmine/pocketmine-mp","ranges":[{"events":[{"introduced":"4.0.0"},{"fixed":"4.0.5"}],"type":"ECOSYSTEM"}],"versions":["4.0.0","4.0.1","4.0.2","4.0.3","4.0.4"],"fixed":["4.0.5"]}],"references":["https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-p62j-hrxm-xcxf","https://github.com/pmmp/PocketMine-MP"],"sources":[{"name":"OSV","id":"GHSA-p62j-hrxm-xcxf","modified":"2026-09-08T12:38:05.325888975Z","url":"https://osv.dev/vulnerability/GHSA-p62j-hrxm-xcxf"}],"assessments":[{"source":"OSV","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":6.5}]}