CVE-2026-27572 - Wasmtime can panic when adding excessive fields to a `wasi:http/types.fields` instance

CVE-2026-27572 - Wasmtime can panic when adding excessive fields to a `wasi:http/types.fields` instance

https://cvefeed.io/rssfeed/latest.atom / Wed, 02/25/2026 - 02:03
CVE ID : CVE-2026-27572
Published : Feb. 24, 2026, 10:16 p.m. | 2 hours, 8 minutes ago
Description : 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.
Severity: 6.9 | MEDIUM
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