Improper Check for Unusual or Exceptional Conditions in Wasmtime - #VU153230
Published: October 3, 2026
Vulnerability identifier: #VU153230
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-754
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an improper check for unusual or exceptional conditions in the WASIp3 filesystem timestamp conversion in wasmtime-wasi on Unix hosts when processing a guest-supplied timestamp before the Unix epoch. A remote attacker can specify a pre-epoch filesystem timestamp through the WASIp3 set-times or set-times-at methods to cause a denial of service.
Only WASIp3 configurations on Unix that provide the guest with a mutable preopened descriptor are affected.
Affected software
Wasmtime
Remediation
Install security update from vendor's website.
Wasmtime - addressed in versions 48.0.4, 49.0.2