CVE-2026-119132

Medium

Description

Wasmtime from 49.0.0 before 49.0.3 contains a denial-of-service vulnerability that allows a WebAssembly guest to trigger a host panic by transcoding overlapping strings in fused adapters. Attackers can make a same-instance component-to-component call transferring a string whose source and destination alias each other, crashing the host instead of raising a trap.

SeverityMedium

CVSS4.8

Exploit probability—

ProductBytecodealliance Wasmtime

PublishedOct 29, 2026

First seenNov 4, 2026

Weakness typeCWE-617CWE-617

How to fix

Update

bytecodealliance wasmtime49.0.3 or later

Vendor advisories

github.com/bytecodealliance/wasmtime/security/advisories/GHSA-54p9-vhhq-8f7q

Affected products

Product	Affected versions	Fixed in
bytecodealliance wasmtime	49.0.0 ≤ v < 49.0.3	49.0.3

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