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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
bytecodealliance wasmtime
>= 30.0.0, < 36.0.8affected>= 37.0.0, < 43.0.2affected44.0.0affected
References
- https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-p8xm-42r7-89xg ↗
- https://access.redhat.com/security/cve/CVE-2026-44216 ↗
- https://bugzilla.redhat.com/show_bug.cgi?id=2477467 ↗
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44216.json ↗
- https://access.redhat.com/errata/RHSA-2026:45341 ↗