Description
Wasmtime 46.0.0 before 48.0.7 and 49.0.0 before 49.0.4 fails to check forwarded trailers against the WasiHttpHooks::is_forbidden_header hook in wasi-http p3. WASIp3 guests can forward a request or response body so its trailers skip embedder-customized forbidden header filtering, undermining header restrictions the embedder intended.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| bytecodealliance | wasmtime | 46.0.0 – < 48.0.7, 49.0.0 – < 49.0.4 | 48.0.7 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| crates.io | wasmtime-wasi-http | >= 46.0.0, < 48.0.7 · >= 49.0.0, < 49.0.4 | 48.0.7, 49.0.4 | RUSTSEC-2026-0377 |