CVE-2026-27572CWE-770

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

Medium · published February 24, 2026

CVSS v4.0
6.9
EPSS
1%
Percentile
54.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.9 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
EPSS
0.00742 · 54.1th percentile
Weakness
CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2026-02-24T21:31Z
EPSS history
Timeline
  • 24 FEB 21:31Z
    Wasmtime can panic when adding excessive fields to a `wasi:http/types.fields` instance
    cvelistv5