{"id":"CVE-2026-115892","aliases":[],"cve":{"records":[{"id":"CVE-2026-115892","source":"GitHub_M","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-23T19:37:27.176Z","published":"2026-10-23T21:26:54.528Z","modified":"2026-10-29T14:44:33.323Z"}],"publishers":[{"name":"GitHub_M","role":"CNA","organizationId":"a0819718-46f1-4df5-94e2-005712e83aaa","modified":"2026-10-23T21:26:54.528Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-29T14:44:33.323Z"}],"references":[{"url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-9pvw-hwfg-92h5","tags":["x_refsource_CONFIRM"],"source":"GitHub_M"},{"url":"https://github.com/bytecodealliance/wasmtime/pull/14819","tags":["x_refsource_MISC"],"source":"GitHub_M"},{"url":"https://github.com/bytecodealliance/wasmtime/pull/14820","tags":["x_refsource_MISC"],"source":"GitHub_M"},{"url":"https://github.com/bytecodealliance/wasmtime/pull/14827","tags":["x_refsource_MISC"],"source":"GitHub_M"},{"url":"https://github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937751a0bac5abd","tags":["x_refsource_MISC"],"source":"GitHub_M"},{"url":"https://github.com/bytecodealliance/wasmtime/commit/48dacc76241f06088e79f3ce1b17642f2f7bf158","tags":["x_refsource_MISC"],"source":"GitHub_M"},{"url":"https://github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17b9f67b31e618","tags":["x_refsource_MISC"],"source":"GitHub_M"},{"url":"https://github.com/bytecodealliance/wasmtime/releases/tag/v48.0.7","tags":["x_refsource_MISC"],"source":"GitHub_M"},{"url":"https://github.com/bytecodealliance/wasmtime/releases/tag/v49.0.4","tags":["x_refsource_MISC"],"source":"GitHub_M"}],"weaknesses":[{"id":"CWE-843","description":"CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')","source":"GitHub_M"},{"id":"CWE-248","description":"CWE-248: Uncaught Exception","source":"GitHub_M"}],"applicability":[],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-29T14:44:25.732629Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"no"},{"name":"Technical Impact","value":"partial"}]}]},"title":"Wasmtime: Panic lowering a host-created component model stream into a guest that expects a different payload type","titleSource":"GitHub_M","descriptionSource":"GitHub_M","description":"Wasmtime is a runtime for WebAssembly. From 46.0.0 until 48.0.7 and 49.0.4, lowering a host-created component-model stream or future into a guest can omit a required payload-type check after the value passes through guest code and returns through StreamAny, FutureAny, Val::Stream, Val::Future, or an equivalent typed reader. A malicious guest that controls exported function types or returned values can cause the host to pass the type-erased value to a guest expecting a different payload type, which panics the Wasmtime host. This issue is fixed in versions 48.0.7 and 49.0.4.","score":5.7,"severity":"medium","published":"2026-10-23T21:26:54.528Z","modified":"2026-10-29T14:44:33.323Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"bytecodealliance","name":"wasmtime","platforms":[],"versions":[{"version":">= 46.0.0, < 48.0.7","status":"affected"},{"version":">= 49.0.0, < 49.0.4","status":"affected"}],"cpes":[],"source":"GitHub_M","url":"https://www.cve.org/CVERecord?id=CVE-2026-115892"}],"remediation":[],"references":["https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-9pvw-hwfg-92h5","https://github.com/bytecodealliance/wasmtime/pull/14819","https://github.com/bytecodealliance/wasmtime/pull/14820","https://github.com/bytecodealliance/wasmtime/pull/14827","https://github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937751a0bac5abd","https://github.com/bytecodealliance/wasmtime/commit/48dacc76241f06088e79f3ce1b17642f2f7bf158","https://github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17b9f67b31e618","https://github.com/bytecodealliance/wasmtime/releases/tag/v48.0.7","https://github.com/bytecodealliance/wasmtime/releases/tag/v49.0.4"],"sources":[{"name":"CVE","id":"CVE-2026-115892","modified":"2026-10-29T14:44:33.323Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-115892"}],"assessments":[{"source":"GitHub_M","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":5.7}],"sourceAffected":[],"observedAt":"2026-10-29T15:14:45.422Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T09:10:30.844Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-10-29T15:25:37.236Z","attemptedAt":"2026-10-29T15:25:37.236Z"},{"source":"GHSA","status":"available","checkedAt":"2026-10-29T15:25:37.953Z","attemptedAt":"2026-10-29T15:25:37.953Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-29T15:25:37.953Z","attemptedAt":"2026-10-29T15:25:37.953Z"},{"source":"EPSS","status":"available","checkedAt":"2026-10-29T15:25:37.220Z","attemptedAt":"2026-10-29T15:25:37.220Z"}],"evidence":[{"source":"FIRST EPSS","id":"CVE-2026-115892","url":"https://www.first.org/epss/","probability":0.00434,"percentile":0.37603,"date":"2026-10-29","checkedAt":"2026-10-29T15:25:37.220Z"},{"source":"NVD","id":"CVE-2026-115892","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-115892","modified":"2026-10-29T15:17:19.493","score":5.7,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/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":"2026-10-29T15:25:37.236Z"},{"source":"GitHub Advisory Database","id":"GHSA-9pvw-hwfg-92h5","url":"https://github.com/advisories/GHSA-9pvw-hwfg-92h5","modified":"2026-10-23T22:04:47Z","checkedAt":"2026-10-29T15:25:37.953Z"},{"source":"ENISA EUVD","id":"EUVD-2026-109187","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-109187","modified":"Oct 29, 2026, 2:44:33 PM","score":5.7,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","checkedAt":"2026-10-29T15:25:37.953Z"}],"aiSummary":{"text":"Wasmtime versions 46.0.0 to 48.0.7 and 49.0.0 to 49.0.4 have a weakness where a malicious guest can cause the host to panic by passing a type-erased value to a guest expecting a different payload type. The host must have access to the guest code. The stated impact is a panic of the Wasmtime host.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T09:15:08.031Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-115892"}]}}