{"affected":[{"defaultStatus":"unaffected","ecosystem":"cargo","packageName":"wasmtime-wasi-http","product":"wasmtime","source":"CNA: VulnCheck","vendor":"bytecodealliance","versions":[{"lessThan":"36.0.19","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"36.0.19","versionType":"semver"},{"lessThan":"48.0.7","status":"affected","version":"37.0.0","versionType":"semver"},{"status":"unaffected","version":"48.0.7","versionType":"semver"},{"lessThan":"49.0.4","status":"affected","version":"49.0.0","versionType":"semver"},{"status":"unaffected","version":"49.0.4","versionType":"semver"}]}],"cveId":"CVE-2026-121441","cwes":["CWE-444"],"description":"Wasmtime before 36.0.19, 37.0.0 before 48.0.7, and 49.0.0 before 49.0.4 contains a request smuggling vulnerability in wasi-http that allows guests to set multiple conflicting content-length headers. Malicious guests can make the host send HTTP requests with conflicting content-length values to smuggle requests through servers or intermediaries that do not reject them.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":6.3,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"},{"score":3.7,"severity":"low","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"}],"modifiedAt":1793725065823,"publishedAt":1793716111931,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-r8xh-cgf7-392j"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/wasmtime-before-36.0.19-37.0.0-before-48.0.7-and-49.0.0-before-49.0.4-wasi-http-request-smuggling"}],"remediation":[],"revision":"5503de2d4b88891dc902ffdaad5bb909f39a32f9d40625cb3d6f9afa107cf41b","sources":[{"modifiedAt":1793725065823,"name":"CNA: VulnCheck","retrievedAt":1793725905549,"url":"https://www.cve.org/CVERecord?id=CVE-2026-121441"}],"ssvc":{"assessedAt":1793725042556,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Wasmtime before 36.0.19, 37.0.0 before 48.0.7, and 49.0.0 before 49.0.4 wasi-http Request Smuggling","updatedAt":1793725905549}