CVE-2026-40504 — AI Deep Analysis Summary

🚨 **Essence**: A heap buffer overflow in `gravity_vm_exec`. 💥 **Consequences**: Out-of-bounds memory writes leading to **Arbitrary Code Execution (ACE)**.…

🛡️ **Root Cause**: **CWE-122** (Heap-based Buffer Overflow). The flaw lies in how the Gravity VM handles string literals during execution, failing to bound-check memory writes correctly.

📦 **Affected**: **Gravity** by Marco Bambini. Specifically versions **prior to 0.9.6**. It’s a lightweight, embeddable C-based programming language used for various paradigms.

💀 **Impact**: **Full System Compromise**. CVSS 3.1 is **9.8 (Critical)**. Attackers gain **High** Confidentiality, Integrity, and Availability impact. They can execute arbitrary code with the privileges of the process.

⚡ **Exploitation**: **Low Threshold**. **No Auth** required. **No User Interaction** needed. Network-accessible (AV:N). If the application processes untrusted Gravity scripts, it’s game over.

🔍 **Public Exploit**: **No**. The `pocs` field is empty. However, the issue is tracked on GitHub (#437) and detailed by VulnCheck. No public PoC code is currently available for download.

🔎 **Self-Check**: Scan for **Gravity** installations. Check version numbers. If running < **0.9.6**, you are vulnerable. Look for applications embedding the Gravity VM that process user-supplied scripts.

✅ **Fixed**: **Yes**. Patched in version **0.9.6**. See the release notes and commit `18b9195598d9b944376754c6d1ad76e38a4adca1` for the fix details.

🚧 **No Patch Workaround**: **Isolate Input**. Do not execute untrusted Gravity scripts. If embedding, restrict script capabilities or sandbox the execution environment strictly to prevent memory corruption.

🔥 **Urgency**: **CRITICAL**. CVSS 9.8 + No Auth + ACE potential = **Immediate Action Required**. Upgrade to **v0.9.6** or later ASAP. Do not ignore this.