Improper control of a resource through its lifetime in Wasmtime - #VU153224
Published: October 3, 2026
Vulnerability identifier: #VU153224
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-664
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 rooting of garbage-collected references in Wasmtime compiler handling of `try_call` when compiling a Wasm module. A remote user can provide a crafted Wasm module to cause a denial of service.
Exploitation requires GC and exception support, and the callee must trigger garbage collection while a GC reference is live across `try_call`.
Affected software
Wasmtime
Remediation
Install security update from vendor's website.
Wasmtime - addressed in versions 48.0.4, 49.0.2