{"id":"CVE-2026-27572","aliases":["RUSTSEC-2026-0021","GHSA-243v-98vx-264h"],"title":"Panic adding excessive fields to a `wasi:http/types.fields` instance","summary":"Panic adding excessive fields to a `wasi:http/types.fields` instance","severity":"none","vendor":"wasmtime","product":"wasmtime","ecosystem":"rust","affected":["wasmtime >= 41.0.0, < 41.0.4"],"patched":["wasmtime 41.0.4"],"published":"2026-02-24","updated":"2026-10-12","sourceUpdated":"2026-10-12T18:00:13.556608408Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/RUSTSEC-2026-0021","references":[{"url":"https://crates.io/crates/wasmtime"},{"url":"https://rustsec.org/advisories/RUSTSEC-2026-0021.html"},{"url":"https://github.com/bytecodealliance/wasmtime/commit/301dc7162cca51def19131019af1187f45901c0a"}],"tags":["osv","rust"],"epss":0.00663,"epssPercentile":0.50319,"ingestedAt":"2026-10-13T11:45:30.184Z","slug":"CVE-2026-27572","body":"## Overview\n\nThis is an entry in the RustSec database for the Wasmtime security advisory\nlocated at\nhttps://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-243v-98vx-264h\nFor more information see the GitHub-hosted security advisory.\n\n## Affected packages\n\n- `wasmtime >= 41.0.0, < 41.0.4`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `wasmtime 41.0.4`","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}