Wasmtime is a runtime for WebAssembly. Prior to versions 24.0.6, 36.0.6, 4.0.04, 41.0.4, and 42.0.0, Wasmtime's implementation of the `wasi:http/types.fields` resource is susceptible to panics when too many fields are added to the set of headers. Wasmtime's implementation in the `wasmtime-wasi-http` crate is backed by a data structure which panics when it reaches excessive capacity and this condition was not handled gracefully in Wasmtime.
Panicking in a WASI implementation is a Denial of Service vector for embedders and is treated as a security vulnerability in Wasmtime. Wasmtime 24.0.6, 36.0.6, 40.0.4, 41.0.4, and 42.0.0 patch this vulnerability and return a trap to the guest instead of panicking. There are no known workarounds at this time.
Embedders are encouraged to update to a patched version of Wasmtime.
Attack Parameters
Impact Assessment
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products 4
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Bytecodealliance Wasmtime
cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*
|
— |
24.0.6
|
|
Bytecodealliance Wasmtime
cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*
|
25.0.0
|
36.0.6
|
|
Bytecodealliance Wasmtime
cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*
|
37.0.0
|
40.0.4
|
|
Bytecodealliance Wasmtime
cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*
|
41.0.0
|
41.0.4
|