CVE-2026-40504 | Creolabs Gravity before 0.9.6 contains a heap buffer overflo… | CVSS 9.8 CRITICAL

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.

Metadata

CVE ID: CVE-2026-40504
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-04-13 20:29 UTC
Published: 2026-04-16 01:10 UTC
Last updated: 2026-07-14 20:00 UTC
Primary CWE: CWE-122
CWE-122 Heap-based Buffer Overflow
Vendor / Product: marcobambini / gravity
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: yes
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
marcobambini	gravity	—	0 < 0.9.6, 0 < 18b9195598d9b944376754c6d1ad76e38a4adca1

Weakness (CWE)

CWE	Source	Description
CWE-122	cna	CWE-122 Heap-based Buffer Overflow

CVSS scores (2)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3	CRITICAL	4.0	cna	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

References (4)