Summary
PocketMine-MP BookEditPacket crash when inventory slot in the packet is invalid
If a client sends a BookEditPacket with InventorySlot greater than 35, the server will crash due to an unhandled exception thrown by BaseInventory->getItem().
Details
PoC
Using Gophertunnel, use serverConn.WritePacket(&packet.BookEdit{InventorySlot: 36})
Patched versions
This issue was fixed by 47f011966092f275cc1b11f8de635e89fd9651a7, and the fix was released in 5.11.2.
Impact
Server crash, all servers
GHSA-XC7J-WJ36-QJFR has a CVSS score of 7.5 (High). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (5.11.2); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Frequently Asked Questions
- What is GHSA-XC7J-WJ36-QJFR? GHSA-XC7J-WJ36-QJFR is a high-severity security vulnerability in pocketmine/pocketmine-mp (composer), affecting versions < 5.11.2. It is fixed in 5.11.2.
- How severe is GHSA-XC7J-WJ36-QJFR? GHSA-XC7J-WJ36-QJFR has a CVSS score of 7.5 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of pocketmine/pocketmine-mp are affected by GHSA-XC7J-WJ36-QJFR? pocketmine/pocketmine-mp (composer) versions < 5.11.2 is affected.
- Is there a fix for GHSA-XC7J-WJ36-QJFR? Yes. GHSA-XC7J-WJ36-QJFR is fixed in 5.11.2. Upgrade to this version or later.
- Is GHSA-XC7J-WJ36-QJFR exploitable, and should I be worried? Whether GHSA-XC7J-WJ36-QJFR is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether GHSA-XC7J-WJ36-QJFR is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix GHSA-XC7J-WJ36-QJFR? Upgrade
pocketmine/pocketmine-mpto 5.11.2 or later.