high7.5
CVE-2026-44216
wasmtime has a panic when allocating a table exceeding the size of the host's address space
Impact
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 | Affected | Fixed in |
|---|---|---|---|
| rust | wasmtime | >= 30.0.0, < 36.0.8 | 36.0.8 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Bytecodealliance | Wasmtime | from 30.0.0 before 36.0.8 from 37.0.0 before 43.0.2 Version 44.0.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-p8xm-42r7-89xg
- https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-p8xm-42r7-89xg
- https://rustsec.org/advisories/RUSTSEC-2026-0114.html
- https://nvd.nist.gov/vuln/detail/CVE-2026-44216
- https://access.redhat.com/errata/RHSA-2026:45341
- 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