CVE-2026-40504 CRITICAL

CVE-2026-40504: Creolabs Gravity < 0.9.6 Heap Buffer Overflow via gravity_vm_exec

Vendor Marcobambini
Product gravity
Weakness CWE-122
Published April 16, 2026
Last update April 16, 2026

CVSS base score

9.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 16, 2026 CVE published
April 16, 2026 Record updated