CVE-2026-115384

CriticalCVSS 9.9/10Last modified Oct 29, 2026

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.

Metrics

CVSS 3.1 9.9/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Weakness enumeration

CWE-20

Affected software

Vendor	Product	Versions
bytecodealliance	wasmtime	>= 39.0.0, < 48.0.4; >= 49.0.0, < 49.0.2

References

Timeline

Published: Oct 22, 2026
Last modified: Oct 29, 2026
NVD status: Deferred

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