{"id":"CVE-2026-119143","state":"PUBLISHED","title":"Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Panic via Zero-Length Stream Writes","description":"Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a denial of service vulnerability that allows guest code to trigger a host panic through out-of-bounds zero-length stream operations. Malicious guests can perform zero-length component model stream reads or writes with unvalidated addresses, causing Direct{Source,Destination}::remaining to panic and crash WASIp3 embedders.","publishedAt":"2026-10-29T15:58:21.991Z","updatedAt":"2026-10-29T15:58:21.991Z","severity":{"score":5.9,"label":"Medium","version":"4.0","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","source":"VulnCheck"},"assigner":"VulnCheck","products":["bytecodealliance wasmtime"],"affected":[{"vendor":"bytecodealliance","product":"wasmtime","packageURL":"pkg:cargo/wasmtime","defaultStatus":"unaffected","versions":[{"version":"46.0.0","status":"affected","lessThan":"48.0.6","versionType":"semver"},{"version":"48.0.6","status":"unaffected","versionType":"semver"},{"version":"49.0.0","status":"affected","lessThan":"49.0.3","versionType":"semver"},{"version":"49.0.3","status":"unaffected","versionType":"semver"}]}],"references":["https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-93g3-36p8-x2gc","https://www.vulncheck.com/advisories/wasmtime-46.0.0-before-48.0.6-and-49.0.0-before-49.0.3-panic-via-zero-length-stream-writes"],"weaknesses":["CWE-129"],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/119xxx/CVE-2026-119143.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-119143","state":"PUBLISHED","datePublished":"2026-10-29T15:58:21.991Z","dateUpdated":"2026-10-29T15:58:21.991Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-10-29T14:28:41.595Z"},"containers":{"cna":{"title":"Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Panic via Zero-Length Stream Writes","descriptions":[{"lang":"en","value":"Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a denial of service vulnerability that allows guest code to trigger a host panic through out-of-bounds zero-length stream operations. 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