CVE-2026-115384
Critical · 9.9CVSS
9.9
EPSS
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Published
Oct 22, 2026
CISA due date
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The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|
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