CVE-2026-115383

Medium

Description

Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains an improper validation vulnerability that accepts components whose core modules import WebAssembly tags with a subtype of the original type. Malicious guests can mis-type exception object payloads to corrupt the GC heap, causing Wasmtime to panic when the exceptions proposal is enabled.

SeverityMedium

CVSS4.8

Exploit probability—

Product

Microsoft Azl3 Rust

PublishedOct 22, 2026

First seenOct 22, 2026

Weakness typeCWE-1287CWE-1287

How to fix

Vendor advisories

github.com/bytecodealliance/wasmtime/security/advisories/GHSA-cfhf-m2cr-62wj

Affected products

Product	Affected versions	Fixed in
microsoft azl3_rust_1.98.1-1	No range specified	—
microsoft azl3_openvmm_0.1.0-1	No range specified	—
microsoft azl3_rust_1.96.1-2	No range specified	—

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