CVE-2026-44216
High · 7.5CVSS
7.5
EPSS
0.6%
Published
May 14, 2026
CISA due date
—
The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| crates.io | wasmtime | 30.0.0 | 36.0.8 |
| crates.io | wasmtime | 37.0.0 | 43.0.2 |
| openSUSE:Tumbleweed | tree-sitter | 0 | 0.26.8-3.1 |
Related vulnerabilities
- RUSTSEC-2026-0114 Panic when allocating a table exceeding the size of the host's address space Same vulnerability
- CVE-2026-34988 Wasmtime is a runtime for WebAssembly. Also affects wasmtime
- CVE-2026-35195 Wasmtime is a runtime for WebAssembly. Also affects wasmtime
- CVE-2026-34987 Wasmtime is a runtime for WebAssembly. Also affects wasmtime
- CVE-2026-35186 Wasmtime is a runtime for WebAssembly. Also affects wasmtime
- CVE-2026-34971 Wasmtime is a runtime for WebAssembly. Also affects wasmtime
- CVE-2026-34983 Wasmtime is a runtime for WebAssembly. Also affects wasmtime
- CVE-2026-34944 Wasmtime is a runtime for WebAssembly. Also affects wasmtime