What’s Vulnerable › Vulnerabilities

CVE-2026-40504: Creolabs Gravity < 0.9.6 Heap Buffer Overflow via gravity_vm_exec

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-16 · updated 2026-10-26
• Weakness: CWE-122

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.

Affected products

• marcobambini Gravity: before 0.9.6 — fixed in 0.9.6

How to fix

Upgrade to a fixed version: marcobambini Gravity 0.9.6. Check the vendor advisory for mitigations.

References

• 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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