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Vulnerability record · CVE-2026-40504 · published 16 April 2026

CVE-2026-40504: Heap-based buffer overflow vulnerability

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.

9.3 CVSS 4.0 Critical EPSS 0.88% · top 42.6% CWE-122 · Heap-based buffer overflow Deferred
9.3CVSS 4.0 base score
0.88%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
14 Jul 2026Last modified by NVD

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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/marcobambini/gravity/commit/18b9195598d9b944376754c6d1ad76e38a4adca1
https://github.com/marcobambini/gravity/issues/437
https://github.com/marcobambini/gravity/releases/tag/0.9.6
https://www.vulncheck.com/advisories/creolabs-gravity-heap-buffer-overflow-via-gravity-vm-exec

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Source: NIST National Vulnerability Database (record CVE-2026-40504), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.