CVE-2026-126409

LowCVSS 2.0/10Last modified Nov 13, 2026

Description

Wasmtime 47.0.0 before 48.0.8, 49.0.0 before 49.0.5, and 50.0.0 before 50.0.1 contains a cross-engine type confusion vulnerability because StructType::with_finality_and_supertype does not validate that the supplied supertype belongs to the same Engine. Embedders using multiple engines that create a GC struct type with another engine's supertype can trigger runtime panics or GC heap corruption, causing denial of service; guest WebAssembly cannot trigger it.

Metrics

CVSS 3.1 2.0/10CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L

Weakness enumeration

CWE-843

Affected software

No affected versions have been published.

Timeline

Published: Nov 13, 2026
Last modified: Nov 13, 2026
NVD status: Deferred

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