Summary
generated automatically from NVD dataWasmtime versions 39.0.0 before 48.0.4 and 49.0.0 before 49.0.2 have a stack buffer overflow caused by unvalidated result types of async callbacks. A malicious guest can supply a component with mistyped component-model-async callback functions and write about 16KB onto the native stack, overwriting return addresses. This can crash the host or let the guest escape the sandbox, and the flaw is rated CRITICAL with a CVSS v3.1 score of 9.9.
NVD description
Wasmtime 39.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a stack buffer overflow vulnerability that allows malicious guests to write ~16KB to the native stack via unvalidated async callback result types. Attackers can supply components with mistyped component-model-async callback functions to overwrite return addresses, crashing the host or escaping the sandbox.
In-depth analysis on cveo.tech
We've published a detailed analysis of this CVE — exploitation, IOCs and mitigation.
CVSS v3.1 Score
Information
- Published
- 22 oct. 2026
- Updated
- 22 oct. 2026
- Status
- Deferred
- Source
- disclosure@vulncheck.com
Weaknesses (CWE)
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