marcobambini gravity up to 0.9.5 gravity_vm_exec heap-based overflow

Summaryinfo

A vulnerability, which was classified as critical, was found in marcobambini gravity up to 0.9.5. This issue affects the function gravity_vm_exec. Executing a manipulation can lead to heap-based overflow. This vulnerability is handled as CVE-2026-40504. The attack can be executed remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in marcobambini gravity up to 0.9.5. It has been declared as critical. This vulnerability affects the function gravity_vm_exec. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was released by segv0x as 437. The advisory is shared for download at github.com. This vulnerability was named CVE-2026-40504 since 04/13/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

Upgrading to version 0.9.6 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 18b9195598d9b944376754c6d1ad76e38a4adca1 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• marcobambini

Name

• gravity

Version

• 0.9.0
• 0.9.1
• 0.9.2
• 0.9.3
• 0.9.4
• 0.9.5

License

• open-source

Website

• Product: https://github.com/marcobambini/gravity/

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