Stack-based buffer overflow in Wasmtime - #VU153229
Published: October 3, 2026
Vulnerability identifier: #VU153229
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary host code.
The vulnerability exists due to a stack-based buffer overflow in async-lifted callback handling when processing a crafted component with an invalid callback return signature. A remote attacker can provide a crafted component to execute arbitrary host code.
Exploitation requires the component-model-async feature to be enabled.
Affected software
Wasmtime
Remediation
Install security update from vendor's website.
Wasmtime - addressed in versions 48.0.4, 49.0.2