Improper Check for Unusual or Exceptional Conditions in Wasmtime - #VU153227
Published: October 3, 2026
Vulnerability identifier: #VU153227
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-754
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 handling of a zero timeout in the wasi:http implementation when processing a between-bytes-timeout request option with a zero timeout. A remote user can specify a zero timeout to cause a denial of service.
Only use of the wasmtime-wasi-http crate with the default-send-request Cargo feature enabled is affected.
Affected software
Wasmtime
Remediation
Install security update from vendor's website.
Wasmtime - addressed in versions 48.0.4, 49.0.2