Buffer overflow in Marcobambini Gravity
CVE-2026-40504
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.009 (57.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.009 · change: +0.002
Affected products
- Marcobambini Gravity — versions 0
Weakness classification (CWE)
References
- github.com/marcobambini/gravity/releases/tag/0.9.6 (release-notes)
- github.com/marcobambini/gravity/issues/437 (issue-tracking)
- github.com/marcobambini/gravity/commit/18b9195598d9b944376754c6d1ad76e38a4adca1 (patch)
- www.vulncheck.com/advisories/creolabs-gravity-heap-buffer-overflow-via-gravity-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-40504?
- CVE-2026-40504 is a critical-severity vulnerability in Marcobambini Gravity, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-04-16.
- How severe is CVE-2026-40504?
- Critical severity. CVSS v3 base score is 9.8 out of 10.