Vulnerability Description
Wasmtime is a runtime for WebAssembly. From 30.0.0 to 36.0.8, 43.0.2, and 44.0.1, Wasmtime's allocation logic for a WebAssembly table contained checked arithmetic which panicked on overflow. This overflow is possible to trigger, and thus panic, when a table with an extremely large size is allocated. This is possible with the WebAssembly memory64 proposal where tables can have sizes in the 64-bit range as opposed to the previous 32-bit range which would not overflow. The panic happens when attempting to create a very large table, such as when instantiating a WebAssembly module or component. This vulnerability is fixed in 36.0.8, 43.0.2, and 44.0.1.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Bytecodealliance | Wasmtime | >= 30.0.0, < 36.0.8 |
Related Weaknesses (CWE)
References
- https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-p8xm-42r7-MitigationVendor Advisory
FAQ
What is CVE-2026-44216?
CVE-2026-44216 is a vulnerability with a CVSS score of 7.5 (HIGH). Wasmtime is a runtime for WebAssembly. From 30.0.0 to 36.0.8, 43.0.2, and 44.0.1, Wasmtime's allocation logic for a WebAssembly table contained checked arithmetic which panicked on overflow. This over...
How severe is CVE-2026-44216?
CVE-2026-44216 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-44216?
Check the references section above for vendor advisories and patch information. Affected products include: Bytecodealliance Wasmtime.