UBUNTU-CVE-2026-119135

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UBUNTU-CVE-2026-119135

Summary:

Details: Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 panics when the host reads a component model stream as a different Rust item type than it was created with, because the host-to-host read path asserts matching TypeIds instead of returning an error. Guest code can return a host-created StreamReader<U> that the embedder reads as StreamReader<T>, where both types map to the same component model type, crashing the embedding process.

References: https://ubuntu.com/security/CVE-2026-119135, https://www.cve.org/CVERecord?id=CVE-2026-119135, https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-63h4-6cx9-pjfj, https://www.vulncheck.com/advisories/wasmtime-46.0.0-before-48.0.6-and-49.0.0-before-49.0.3-panic-via-streamreader-type-mismatch