{"id":"CVE-2022-51018","aliases":["EUVD-2022-56047","GHSA-p62j-hrxm-xcxf","GHSA-q643-57w3-775x"],"status":"published","title":"PocketMine-MP before 3.26.5 and 4.0.5 Input Validation via Book Pages","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).","severity":{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00436,"percentile":0.38285,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-400"],"published":"2022-01-06T23:53:35Z","modified":"2026-11-10T12:10:00Z","fixes":[{"ecosystem":"Packagist","package":"pocketmine/pocketmine-mp","fixed_in":["3.26.5","4.0.5"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"pocketmine/pocketmine-mp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.26.5"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"pocketmine/pocketmine-mp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"4.0.5"}]}]},{"source":"osv","ecosystem":"Packagist","package":"pocketmine/pocketmine-mp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.26.5"}]}],"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"]},{"source":"osv","ecosystem":"Packagist","package":"pocketmine/pocketmine-mp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"4.0.5"}]}],"versions":["4.0.0","4.0.1","4.0.2","4.0.3","4.0.4"]}],"products":[{"vendor":"pmmp","product":"pocketmine-mp"}],"references":[{"url":"https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-p62j-hrxm-xcxf","tags":["vendor-advisory","advisory","web"]},{"url":"https://www.vulncheck.com/advisories/pocketmine-mp-before-3.26.5-input-validation-via-book-pages","tags":["third-party-advisory","advisory"]},{"url":"https://github.com/advisories/GHSA-p62j-hrxm-xcxf"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-51018","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-q643-57w3-775x"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/51xxx/CVE-2022-51018.json","tags":["advisory"]},{"url":"https://github.com/pmmp/PocketMine-MP","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2022-51018","title":"PocketMine-MP before 3.26.5 and 4.0.5 Input Validation via Book Pages","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).","status":"published","published":"2026-09-07T12:55:10.538Z","modified":"2026-10-08T15:21:02.576Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:34:27.327929Z"}],"euvd":[{"id":"EUVD-2022-56047","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).","status":"published","published":"2026-09-07T12:55:10Z","modified":"2026-10-08T15:21:02Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T17:27:32.18003Z"}],"ghsa":[{"id":"GHSA-p62j-hrxm-xcxf","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) \u003e 1024 || mb_strlen(text) \u003e 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","status":"published","published":"2022-01-06T23:53:35Z","modified":"2023-01-11T05:03:21Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T14:36:12.361159Z"},{"id":"GHSA-q643-57w3-775x","title":"PocketMine-MP before 3.26.5 and 4.0.x before 4.0.5 does not limit book page text length, page...","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).","status":"published","published":"2026-09-07T15:33:51Z","modified":"2026-09-07T15:33:55Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T15:11:26.557204Z"}],"nvd":[{"id":"CVE-2022-51018","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).","status":"published","published":"2026-09-07T13:17:23.893Z","modified":"2026-11-10T12:10:00.177Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-400"],"updated_at":"2026-11-10T14:19:26.790498Z"}],"osv":[{"id":"CVE-2022-51018","title":"PocketMine-MP before 3.26.5 and 4.0.5 Input Validation via Book Pages","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).","status":"published","published":"2026-09-07T12:55:10.538Z","modified":"2026-10-28T02:30:31.011606296Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T15:44:29.084154Z"},{"id":"GHSA-p62j-hrxm-xcxf","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) \u003e 1024 || mb_strlen(text) \u003e 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","status":"published","published":"2022-01-06T23:53:35Z","modified":"2026-09-08T12:38:05.325888975Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:46:52.891208Z"}]}}