{"id":"CVE-2026-27572","revision":"62b99b9cecc6416cace50f7f72996f81","records":[{"revision":"62b99b9cecc6416cace50f7f72996f81","observedAt":"2026-10-25T06:17:28.833+00:00","statement":{"source":"nvd","id":"CVE-2026-27572","aliases":[],"title":"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 he…","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.","state":0,"publishedAt":"2026-02-24T22:16:32.687+00:00","modifiedAt":"2026-06-17T10:27:19.773+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":6.9,"severity":"MEDIUM"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://docs.rs/http/1.4.0/http/header/#limitations","https://github.com/bytecodealliance/wasmtime/commit/301dc7162cca51def19131019af1187f45901c0a","https://github.com/bytecodealliance/wasmtime/releases/tag/v24.0.6","https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.6","https://github.com/bytecodealliance/wasmtime/releases/tag/v40.0.4","https://github.com/bytecodealliance/wasmtime/releases/tag/v41.0.4","https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-243v-98vx-264h"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-27572","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-770"],"productCriteria":["cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*"],"sourceDates":{"published":"2026-02-24T22:16:32.687","lastModified":"2026-06-17T10:27:19.773"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-27572","identifiers":["CVE-2026-27572"]},"retained":false,"historicalAffected":[]}],"coverage":[]}