Resource exhaustion in Wasmtime - #VU153225
Published: October 3, 2026
Vulnerability identifier: #VU153225
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-400
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to missing fuel consumption checks in the WASI preview 0 implementation of poll_oneoff when processing subscriptions. A remote attacker can invoke poll_oneoff with many subscriptions to cause a denial of service.
Exploitation requires WASI preview 0 support to be enabled.
Affected software
Wasmtime
Remediation
Install security update from vendor's website.
Wasmtime - addressed in versions 36.0.17, 48.0.4, 49.0.2