Resource exhaustion in Wasmtime - #VU153032
Published: September 30, 2026
Vulnerability identifier: #VU153032
CSH Severity: Low
CVSS v4: 1 [CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-400
Exploitation vector: Adjecent network
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 inadequate resource accounting in the dynamically typed Val API when loading a value returned by a guest. A remote user can return a value that causes excessive host memory allocations to cause a denial of service.
Only hosts using the Val API are affected; hosts using bindgen! or other statically typed APIs are unaffected.
Affected software
Wasmtime
Remediation
Install security update from vendor's website.
Wasmtime - addressed in versions 36.0.16, 48.0.3, 49.0.1