Critical Severity Vulnerability
This vulnerability has been rated as Critical severity. Immediate action is recommended.
CVE-2026-40504
Critical
Low
Medium
High
Critical
9.8
CVSS Score
Vulnerability Description
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.
CVSS Metrics
Common Vulnerability Scoring System
Vector String:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
N
Attack Complexity
L
Privileges Required
N
User Interaction
N
Scope
U
Confidentiality
H
Integrity
H
Availability
H
References & Resources
-
https://github.com/marcobambini/gravity/commit/18b9195598d9b944376754c6d1ad76e38a4adca1disclosure@vulncheck.com
-
https://github.com/marcobambini/gravity/issues/437disclosure@vulncheck.com
-
https://github.com/marcobambini/gravity/releases/tag/0.9.6disclosure@vulncheck.com
-
https://www.vulncheck.com/advisories/creolabs-gravity-heap-buffer-overflow-via-gravity-vm-execdisclosure@vulncheck.com
Severity Details
9.8
out of 10.0
Critical
Weakness Type (CWE)
CWE-122
Heap-based Buffer Overflow
- Description
- A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
- Exploit Likelihood
- High
- Typical Severity
- High
- Abstraction Level
- Variant
Key Information
- Published Date
- April 16, 2026
