{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-27572","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-02-20T17:40:28.448Z","datePublished":"2026-02-24T21:31:50.186Z","dateUpdated":"2026-02-27T20:55:29.879Z"},"containers":{"cna":{"title":"Wasmtime can panic when adding excessive fields to a `wasi:http/types.fields` instance","problemTypes":[{"descriptions":[{"cweId":"CWE-770","lang":"en","description":"CWE-770: Allocation of Resources Without Limits or Throttling","type":"CWE"}]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"LOW","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"HIGH","baseScore":6.9,"baseSeverity":"MEDIUM","vectorString":"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","version":"4.0"}}],"references":[{"name":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-243v-98vx-264h","tags":["x_refsource_CONFIRM"],"url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-243v-98vx-264h"},{"name":"https://github.com/bytecodealliance/wasmtime/commit/301dc7162cca51def19131019af1187f45901c0a","tags":["x_refsource_MISC"],"url":"https://github.com/bytecodealliance/wasmtime/commit/301dc7162cca51def19131019af1187f45901c0a"},{"name":"https://docs.rs/http/1.4.0/http/header/#limitations","tags":["x_refsource_MISC"],"url":"https://docs.rs/http/1.4.0/http/header/#limitations"},{"name":"https://github.com/bytecodealliance/wasmtime/releases/tag/v24.0.6","tags":["x_refsource_MISC"],"url":"https://github.com/bytecodealliance/wasmtime/releases/tag/v24.0.6"},{"name":"https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.6","tags":["x_refsource_MISC"],"url":"https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.6"},{"name":"https://github.com/bytecodealliance/wasmtime/releases/tag/v40.0.4","tags":["x_refsource_MISC"],"url":"https://github.com/bytecodealliance/wasmtime/releases/tag/v40.0.4"},{"name":"https://github.com/bytecodealliance/wasmtime/releases/tag/v41.0.4","tags":["x_refsource_MISC"],"url":"https://github.com/bytecodealliance/wasmtime/releases/tag/v41.0.4"}],"affected":[{"vendor":"bytecodealliance","product":"wasmtime","versions":[{"version":"< 24.0.6","status":"affected"},{"version":">= 25.0.0, < 36.0.6","status":"affected"},{"version":">= 37.0.0, < 40.0.4","status":"affected"},{"version":">= 41.0.0, < 41.0.4","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-02-24T21:31:50.186Z"},"descriptions":[{"lang":"en","value":"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."}],"source":{"advisory":"GHSA-243v-98vx-264h","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-02-27T20:55:20.616278Z","id":"CVE-2026-27572","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-02-27T20:55:29.879Z"}}]}}