Improper control of a resource through its lifetime in Wasmtime - #VU140664
Published: August 1, 2026
Vulnerability identifier: #VU140664
CSH Severity: Low
CVSS v4: 1.8 [CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:N/VI:L/VA:L/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 memory corruption or a denial of service.
The vulnerability exists due to stale pointer handling in bulk-data-transfer operations when preemption occurs and the store state is mutated or execution is resumed after cancellation. A remote privileged user can trigger preemption during a bulk operation and alter store state to cause memory corruption or a denial of service.
Exploitation requires embedding patterns such as using epoch deadline callbacks to mutate store state or continuing to execute wasm within the same store after a timeout or trap.
Affected software
Wasmtime
Remediation
Install security update from vendor's website.
Wasmtime - addressed in versions 46.0.2, 47.0.3