{"affected":[{"defaultStatus":"unaffected","ecosystem":"cargo","packageName":"wasmtime","product":"wasmtime","source":"CNA: VulnCheck","vendor":"bytecodealliance","versions":[{"lessThan":"36.0.20","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"36.0.20","versionType":"semver"}]},{"defaultStatus":"unaffected","ecosystem":"cargo","packageName":"wasmtime","product":"wasmtime","source":"CNA: VulnCheck","vendor":"bytecodealliance","versions":[{"lessThan":"48.0.8","status":"affected","version":"37.0.0","versionType":"semver"},{"status":"unaffected","version":"48.0.8","versionType":"semver"}]},{"defaultStatus":"unaffected","ecosystem":"cargo","packageName":"wasmtime","product":"wasmtime","source":"CNA: VulnCheck","vendor":"bytecodealliance","versions":[{"lessThan":"49.0.5","status":"affected","version":"49.0.0","versionType":"semver"},{"status":"unaffected","version":"49.0.5","versionType":"semver"}]},{"defaultStatus":"unaffected","ecosystem":"cargo","packageName":"wasmtime","product":"wasmtime","source":"CNA: VulnCheck","vendor":"bytecodealliance","versions":[{"lessThan":"50.0.1","status":"affected","version":"50.0.0","versionType":"semver"},{"status":"unaffected","version":"50.0.1","versionType":"semver"}]}],"cveId":"CVE-2026-126407","cwes":["CWE-770"],"description":"Wasmtime before 36.0.20, 37.0.0 before 48.0.8, 49.0.0 before 49.0.5, and 50.0.0 before 50.0.1 allocates untracked host memory when a component receives a borrow of a resource it defines itself, bypassing the per-store handle limit. A malicious guest component can repeatedly transfer such borrowed resources to consume arbitrary host memory, causing denial of service.","epss":{"date":"2026-11-13","percentile":0.30972,"score":0.00367},"exploits":[],"kev":null,"metrics":[{"score":5.9,"severity":"medium","source":"CNA: VulnCheck","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:N","version":"4.0"},{"score":4.8,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H","version":"3.1"},{"score":5.9,"severity":"medium","source":"NVD: disclosure@vulncheck.com","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:N/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","version":"4.0"},{"score":4.8,"severity":"medium","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H","version":"3.1"}],"modifiedAt":1794585330553,"publishedAt":1794562543638,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-6fr9-xmw9-5352"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/wasmtime-before-36.0.20-denial-of-service-via-borrowed-resource-transfer"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-6fr9-xmw9-5352"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/wasmtime-before-36.0.20-denial-of-service-via-borrowed-resource-transfer"}],"remediation":[],"revision":"84b0117db78ec41d09e14dd06d356111bafc5515a36bd3d0e8109cc8afd5d095","sources":[{"modifiedAt":1794585330553,"name":"CNA: VulnCheck","retrievedAt":1794586215397,"url":"https://www.cve.org/CVERecord?id=CVE-2026-126407"},{"modifiedAt":1794565065770,"name":"NVD","retrievedAt":1794572197413,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126407"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794586219328,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-126407"}],"ssvc":{"assessedAt":1794583823930,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Wasmtime before 36.0.20 Denial of Service via Borrowed Resource Transfer","updatedAt":1794586219328}