Cloudanix VulnDB

CVE-2026-27572

High · 7.5

CVSS

7.5

EPSS

0.7%

Published

Feb 24, 2026

CISA due date

—

The record

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.

Affected packages

Ecosystem Package Introduced Fixed
crates.io wasmtime 0 24.0.6
crates.io wasmtime 0.0.0-0 24.0.6
crates.io wasmtime 25.0.0 36.0.6
crates.io wasmtime 37.0.0 40.0.4
Chainguard wasmcloud 0 2.0.1-r0
Chainguard wizer 0 10.0.0-r7
Chainguard yara-x 0 1.13.0-r2
Chainguard zellij 0 0.44.0-r0
Wolfi wasmcloud 0 2.0.1-r0
Wolfi wizer 0 10.0.0-r7
Wolfi yara-x 0 1.13.0-r2
Wolfi zellij 0 0.44.0-r0

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