Description
Wasmtime 46.0.0 before 48.0.7 and 49.0.0 before 49.0.4 contains a response splitting vulnerability in wasi-http p3 that allows guests to set unvalidated content-length headers. Malicious wasip3 guests can splice an existing body into a new response with an incorrect content-length to perform response splitting or injection attacks.
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-2026-0375 |