Allocation of Resources Without Limits or Throttling in Wasmtime - #VU153226
Published: October 3, 2026
Vulnerability identifier: #VU153226
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-770
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 allocation of resources without limits or throttling in the SinkOutputStream write-zeros method when handling write-zeros operations from guests without configured stdout or stderr streams. A remote user can trigger an unbounded write-zeros operation to cause a denial of service.
Only embeddings without configured stdout or stderr streams are affected.
Affected software
Wasmtime
Remediation
Install security update from vendor's website.
Wasmtime - addressed in versions 36.0.17, 48.0.4, 49.0.2