CVE-2026-44216
MEDIUM
MEDIUM
Priority: 0.02
BB Relevance:
52/100
Published: 2026-05-14
Modified: 2026-10-26
First seen: 2026-10-29
Status: active
Attack Surface
Network
Low Complexity
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
Low
UI:
Passive
S:
X
AT:
Present
VC:
None
VI:
None
VA:
High
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 Software (2)
| Vendor | Product | Version |
|---|---|---|
| bytecodealliance | wasmtime | 30.0.0 – 36.0.8 |
| bytecodealliance | wasmtime | 44.0.0 |
References & Advisories (5)
Mitigation
Vendor Advisory