{"id":"CVE-2026-119135","aliases":["RUSTSEC-2026-0355","GHSA-63h4-6cx9-pjfj"],"title":"Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Panic via StreamReader Type Mismatch","titleSource":"VulnCheck","descriptionSource":"OSV","description":"This is an entry in the RustSec database for the Wasmtime security advisory\nlocated at\nhttps://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-63h4-6cx9-pjfj\nFor more information see the GitHub-hosted security advisory.","severity":"medium","score":5.9,"published":"2026-10-14T12:00:00.000Z","modified":"2026-10-30T02:55:58.508Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"crates.io","name":"wasmtime","sources":[{"name":"OSV · RUSTSEC-2026-0355","url":"https://osv.dev/vulnerability/RUSTSEC-2026-0355"}],"ranges":[{"events":[{"introduced":"46.0.0"},{"fixed":"48.0.6"},{"introduced":"49.0.0"},{"fixed":"49.0.3"}],"type":"SEMVER"}],"versions":[],"fixed":["48.0.6","49.0.3"]}],"sourceAffected":[],"references":["https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-63h4-6cx9-pjfj","https://www.vulncheck.com/advisories/wasmtime-46.0.0-before-48.0.6-and-49.0.0-before-49.0.3-panic-via-streamreader-type-mismatch","https://crates.io/crates/wasmtime","https://rustsec.org/advisories/RUSTSEC-2026-0355.html","https://github.com/bytecodealliance/wasmtime/pull/14733"],"sources":[{"name":"CVE","id":"CVE-2026-119135","modified":"2026-10-29T15:58:15.914Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-119135"},{"name":"OSV","id":"RUSTSEC-2026-0355","modified":"2026-10-30T02:55:58.508091027Z","url":"https://osv.dev/vulnerability/RUSTSEC-2026-0355"}],"assessments":[{"source":"VulnCheck","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":5.9},{"source":"VulnCheck","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H","score":4.8},{"source":"OSV","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":5.9}],"cve":{"records":[{"id":"CVE-2026-119135","source":"VulnCheck","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-29T14:26:15.522Z","published":"2026-10-29T15:58:15.914Z","modified":"2026-10-29T15:58:15.914Z"}],"publishers":[{"name":"VulnCheck","role":"CNA","organizationId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","modified":"2026-10-29T15:58:15.914Z"}],"references":[{"url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-63h4-6cx9-pjfj","tags":["vendor-advisory"],"source":"VulnCheck"},{"url":"https://www.vulncheck.com/advisories/wasmtime-46.0.0-before-48.0.6-and-49.0.0-before-49.0.3-panic-via-streamreader-type-mismatch","tags":["third-party-advisory"],"source":"VulnCheck"}],"weaknesses":[{"id":"CWE-617","description":"Reachable Assertion","source":"VulnCheck"}],"applicability":[{"source":"VulnCheck","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:*","versionStartIncluding":"46.0.0","versionEndExcluding":"48.0.6"},{"vulnerable":true,"criteria":"cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:*","versionStartIncluding":"49.0.0","versionEndExcluding":"49.0.3"}]}]}]}],"prioritization":[]},"products":[{"vendor":"bytecodealliance","name":"wasmtime","platforms":[],"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"}],"defaultStatus":"unaffected","packageURL":"pkg:cargo/wasmtime","packageIdentity":{"ecosystem":"crates.io","name":"wasmtime"},"cpes":[],"source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-119135"}],"remediation":[],"observedAt":"2026-10-30T03:26:05.539Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T12:00:30.989Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-10-30T03:30:38.524Z","attemptedAt":"2026-10-30T03:30:38.524Z"},{"source":"GHSA","status":"available","checkedAt":"2026-10-30T03:30:38.368Z","attemptedAt":"2026-10-30T03:30:38.368Z"},{"source":"EUVD","status":"refresh-failed","attemptedAt":"2026-10-30T03:30:34.313Z"},{"source":"EPSS","status":"no-result","checkedAt":"2026-10-30T03:30:36.605Z","attemptedAt":"2026-10-30T03:30:36.605Z"}],"evidence":[{"source":"GitHub Advisory Database","id":"GHSA-68fq-q9rp-8gvr","url":"https://github.com/advisories/GHSA-68fq-q9rp-8gvr","modified":"2026-10-29T18:31:00Z","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H","checkedAt":"2026-10-30T03:30:38.368Z"},{"source":"NVD","id":"CVE-2026-119135","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119135","modified":"2026-10-29T16:18:06.870","score":5.9,"vector":"CVSS:4.0/AV:N/AC:H/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","checkedAt":"2026-10-30T03:30:38.524Z"},{"source":"NVD","id":"CVE-2026-119135","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119135","modified":"2026-10-29T16:18:06.870","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H","checkedAt":"2026-10-30T03:30:38.524Z"}],"aiSummary":{"text":"Wasmtime versions 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 have a panic via StreamReader type mismatch weakness, described as a Reachable Assertion. The impact is not specified.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T09:16:41.953Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-119135"},{"name":"OSV","url":"https://osv.dev/vulnerability/RUSTSEC-2026-0355"}]}}