by Kastro
Paper/Archive/CVE-2026-40504

CVE-2026-40504

marcobambini gravity — Creolabs Gravity < 0.9.6 Heap Buffer Overflow via gravity_vm_exec

EPSS 0.6%public exploitCVSS 9.8
critical.is priorityof 100
50
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 50.7.507 × 2010.1Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
gravity< 0.9.60.9.6CNA
gravity< 18b9195598d9b944376754c6d1ad76e38a4adca118b9195598d9b944376754c6d1ad76e38a4adca1CNA

Scores by source

VulnCheck (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
VulnCheck (CNA)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
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

refgithub.com/marcobambini/gravity/releases/tag/0.9.6refgithub.com/marcobambini/gravity/issues/437patchgithub.com/marcobambini/gravity/commit/18b9195598d9b944376754c6d1ad76e38a4adca1writeupvulncheck.com/advisories/creolabs-gravity-heap-buffer-overflow-via-gravity-vm-exec