UBUNTU-CVE-2026-44216

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 Metrics

• v4.0•MEDIUM•Score: 5.9CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
• v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Systems

• ubuntu•rust-wasmtime

  all | all | all

References (3)

• https://ubuntu.com/security/CVE-2026-44216
• https://www.cve.org/CVERecord?id=CVE-2026-44216
• https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-p8xm-42r7-89xg