Reachable assertion in Wasmtime - #VU155847
Published: October 15, 2026
Vulnerability identifier: #VU155847
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-617
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 a reachable assertion in Wasmtime's component::Func::call when invoking guest exports that use the async ABI option. A remote user can cause an async-lifted guest export to be invoked through this function to cause a denial of service through a host panic.
User interaction is required.
Affected software
Wasmtime
Remediation
Install security update from vendor's website.
Wasmtime - addressed in versions 48.0.6, 49.0.3