CVE-2026-40504: Marcobambini Gravity

Critical severity, CVSS 9.8. EPSS: 0.9% chance of exploitation in the next 30 days.

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 by crafting scripts with many string literals at global scope. Attackers can exploit insufficient bounds checking in gravity_fiber_reassign() to corrupt heap metadata and achieve arbitrary code execution in applications that evaluate untrusted scripts.

Affected products

• Marcobambini Gravity: before 0.9.6 (fixed in 0.9.6)

Published 2026-04-16. Last modified 2026-07-14.