{"id":77907,"date":"2026-02-25T01:46:32","date_gmt":"2026-02-24T22:16:32","guid":{"rendered":"https:\/\/afaghhosting.net\/blog\/cve-2026-27572-wasmtime-can-panic-when-adding-excessive-fields-to-a-wasihttp-types-fields-instance\/"},"modified":"2026-02-25T01:46:32","modified_gmt":"2026-02-24T22:16:32","slug":"cve-2026-27572-wasmtime-can-panic-when-adding-excessive-fields-to-a-wasihttp-types-fields-instance","status":"publish","type":"post","link":"https:\/\/afaghhosting.net\/blog\/cve-2026-27572-wasmtime-can-panic-when-adding-excessive-fields-to-a-wasihttp-types-fields-instance\/","title":{"rendered":"CVE-2026-27572 &#8211; Wasmtime can panic when adding excessive fields to a `wasi:http\/types.fields` instance"},"content":{"rendered":"<p>CVE ID : CVE-2026-27572<\/p>\n<p>Published :  Feb. 24, 2026, 10:16 p.m. | 50\u00a0minutes ago<\/p>\n<p>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&#8217;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&#8217;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.<\/p>\n<p>Severity: 6.9 | MEDIUM<\/p>\n<p>Visit the link for more details, such as CVSS details, affected products, timeline, and more&#8230;\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CVE ID : CVE-2026-27572 Published : Feb. 24, 2026, 10:16 p.m. | 50\u00a0minutes 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&#8217;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&#8217;s implementation in &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-77907","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/77907","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=77907"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/77907\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=77907"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=77907"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=77907"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}