Creolabs Gravity before 0.9.6 contains a heap buffer overflow vulnerability in the gravity_vm_exec function that allows attackers to write out-of-bounds memory …

CVE-2026-40504 is a heap buffer overflow vulnerability in Creolabs Gravity before version 0.9.6. The vulnerability exists in the gravity_vm_exec function and allows attackers to write out-of-bounds memory by crafting scripts with many string literals at global scope. Attackers can exploit insufficient bounds checking in gravity_fiber_reassign() to corrupt heap metadata. This can lead to arbitrary code execution in applications that evaluate untrusted scripts. The vulnerability has been patched in version 0.9.6.