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

CVE ID : CVE-2026-27572 Published : Feb. 24, 2026, 10:16 p.m. | 17 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 Visit the link for more details, such as CVSS details, affected products, timeline, and more...