Resource exhaustion in Wasmtime - #VU153033
Published: September 30, 2026
Vulnerability identifier: #VU153033
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-400
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 fuel accounting in the Cranelift backend when compiling guests containing `call_ref` callsites or calls within `try_table` catch paths. A remote user can execute a guest containing these opcodes to cause a denial of service.
Fuel consumption must be enabled, and user interaction is required.
Affected software
Wasmtime
Remediation
Install security update from vendor's website.
Wasmtime - addressed in versions 48.0.3, 49.0.1