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CVE-2026-40959 β€” AI Deep Analysis Summary

CVSS 9.3 Β· Critical

Q1What is this vulnerability? (Essence + Consequences)

🚨 **Essence**: Luanti < 5.15.2 suffers from a **Lua Sandbox Escape** via LuaJIT.…

Q2Root Cause? (CWE/Flaw)

πŸ›‘οΈ **Root Cause**: **CWE-829** (Inclusion of Functionality from Untrusted Control Sphere).…

Q3Who is affected? (Versions/Components)

πŸ“¦ **Affected**: **Luanti** (the open-source voxel game engine). πŸ“‰ **Versions**: All versions **prior to 5.15.2**. If you are running an older build, you are vulnerable. πŸ•°οΈ

Q4What can hackers do? (Privileges/Data)

πŸ’€ **Attacker Actions**: Gain **Host-Level Access**. πŸ“‚ **Data**: Exfiltrate sensitive files. πŸ”§ **Privileges**: Execute arbitrary commands on the host machine.…

Q5Is exploitation threshold high? (Auth/Config)

πŸ”“ **Threshold**: **Low**. πŸ“ **Auth**: **None required** (PR:N). πŸ–±οΈ **UI**: **None required** (UI:N). 🎯 **Access**: Local (AV:L). If a user runs a malicious mod, exploitation is straightforward. πŸš€

Q6Is there a public Exp? (PoC/Wild Exploitation)

πŸ” **Public Exploit**: **No PoC available** in the provided data. πŸ“œ **References**: Official GitHub commits and GHSA advisory exist, but no public exploit code is listed. πŸ•΅οΈβ€β™‚οΈ

Q7How to self-check? (Features/Scanning)

πŸ”Ž **Self-Check**: Verify your **Luanti version number**. πŸ“‹ **Action**: If version < 5.15.2, you are at risk. πŸ” **Scan**: Look for custom mods that interact deeply with LuaJIT internals. πŸ›‘

Q8Is it fixed officially? (Patch/Mitigation)

βœ… **Fixed**: **Yes**. 🩹 **Patch**: Upgrade to **Luanti 5.15.2** or later. πŸ”— **Links**: See GitHub commits `53cef18` and `8a929df` for the official fix details. πŸ“₯

Q9What if no patch? (Workaround)

🚧 **No Patch Workaround**: **Disable Modding**. 🚫 Do not load untrusted mods. πŸ›‘οΈ Isolate the game environment if possible. Since it requires local execution, restrict who can run the game client. 🏠

Q10Is it urgent? (Priority Suggestion)

πŸ”₯ **Urgency**: **HIGH**. 🚨 **Priority**: Patch immediately. With **CVSS 9.0+** potential (S:C, C:H, I:H, A:H), the impact is catastrophic. Even without public exploits, the risk of local privilege escalation is severe. ⏳