Improper Validation of Specified Type of Input in Wasmtime - #VU153228
Published: October 3, 2026
Vulnerability identifier: #VU153228
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-1287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to improper validation of tag types in WebAssembly component validation when processing an invalid component that instantiates a core module importing a WebAssembly tag. A remote user can provide a component with a mis-typed tag import to cause a denial of service.
The WebAssembly exceptions proposal must be enabled, and user interaction is required.
Affected software
Wasmtime
Remediation
Install security update from vendor's website.
Wasmtime - addressed in versions 48.0.4, 49.0.2