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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.

PUBLISHED Reserved 2026-04-13 | Published 2026-04-16 | Updated 2026-04-16 | Assigner VulnCheck




CRITICAL: 9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem types

CWE-122 Heap-based Buffer Overflow

Product status

Default status
unaffected

Any version before 0.9.6
affected

Any version before 18b9195598d9b944376754c6d1ad76e38a4adca1
affected

Credits

segv0x finder

References

github.com/marcobambini/gravity/releases/tag/0.9.6 release-notes

github.com/marcobambini/gravity/issues/437 issue-tracking

github.com/...ommit/18b9195598d9b944376754c6d1ad76e38a4adca1 patch

www.vulncheck.com/...eap-buffer-overflow-via-gravity-vm-exec third-party-advisory

cve.org (CVE-2026-40504)

nvd.nist.gov (CVE-2026-40504)

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