{"id":"CVE-2026-40504","title":"Creolabs Gravity < 0.9.6 Heap Buffer Overflow via gravity_vm_exec","summary":"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 …","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-122"],"vendor":"marcobambini","product":"gravity","affected":["gravity < 0.9.6","gravity < 18b9195598d9b944376754c6d1ad76e38a4adca1"],"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"total","timestamp":"2026-04-16T13:45:28.279979Z"},"exploitAvailable":true,"published":"2026-04-16","updated":"2026-11-08","sourceUpdated":"2026-11-08T14:02:50.663Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-40504","references":[{"url":"https://github.com/marcobambini/gravity/releases/tag/0.9.6","label":"gravity 0.9.6 Release Notes"},{"url":"https://github.com/marcobambini/gravity/issues/437"},{"url":"https://github.com/marcobambini/gravity/commit/18b9195598d9b944376754c6d1ad76e38a4adca1"},{"url":"https://www.vulncheck.com/advisories/creolabs-gravity-heap-buffer-overflow-via-gravity-vm-exec"}],"tags":["cve.org","exploit-available"],"epss":0.0064,"epssPercentile":0.50972,"ingestedAt":"2026-11-08T14:51:22.444Z","slug":"CVE-2026-40504","body":"## Overview\n\nCreolabs 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.\n\n## Affected\n\n- `gravity < 0.9.6`\n- `gravity < 18b9195598d9b944376754c6d1ad76e38a4adca1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"abyssal","depthScore":66,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[]}