{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-115892", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-10-23T19:37:27.176Z", "datePublished": "2026-10-23T21:26:54.528Z", "dateUpdated": "2026-10-23T21:26:54.528Z"}, "containers": {"cna": {"title": "Wasmtime: Panic lowering a host-created component model stream into a guest that expects a different payload type", "problemTypes": [{"descriptions": [{"cweId": "CWE-843", "lang": "en", "description": "CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-248", "lang": "en", "description": "CWE-248: Uncaught Exception", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "HIGH", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 5.7, "baseSeverity": "MEDIUM", "vectorString": "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", "version": "4.0"}}], "references": [{"name": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-9pvw-hwfg-92h5", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-9pvw-hwfg-92h5"}, {"name": "https://github.com/bytecodealliance/wasmtime/pull/14819", "tags": ["x_refsource_MISC"], "url": "https://github.com/bytecodealliance/wasmtime/pull/14819"}, {"name": "https://github.com/bytecodealliance/wasmtime/pull/14820", "tags": ["x_refsource_MISC"], "url": "https://github.com/bytecodealliance/wasmtime/pull/14820"}, {"name": "https://github.com/bytecodealliance/wasmtime/pull/14827", "tags": ["x_refsource_MISC"], "url": "https://github.com/bytecodealliance/wasmtime/pull/14827"}, {"name": "https://github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937751a0bac5abd", "tags": ["x_refsource_MISC"], "url": "https://github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937751a0bac5abd"}, {"name": "https://github.com/bytecodealliance/wasmtime/commit/48dacc76241f06088e79f3ce1b17642f2f7bf158", "tags": ["x_refsource_MISC"], "url": "https://github.com/bytecodealliance/wasmtime/commit/48dacc76241f06088e79f3ce1b17642f2f7bf158"}, {"name": "https://github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17b9f67b31e618", "tags": ["x_refsource_MISC"], "url": "https://github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17b9f67b31e618"}, {"name": "https://github.com/bytecodealliance/wasmtime/releases/tag/v48.0.7", "tags": ["x_refsource_MISC"], "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v48.0.7"}, {"name": "https://github.com/bytecodealliance/wasmtime/releases/tag/v49.0.4", "tags": ["x_refsource_MISC"], "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v49.0.4"}], "affected": [{"vendor": "bytecodealliance", "product": "wasmtime", "versions": [{"version": ">= 46.0.0, < 48.0.7", "status": "affected"}, {"version": ">= 49.0.0, < 49.0.4", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-23T21:26:54.528Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-9pvw-hwfg-92h5", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "wasmtime", "vendor": "bytecodealliance", "versions": [{"status": "affected", "version": ">= 46.0.0, < 48.0.7"}, {"status": "affected", "version": ">= 49.0.0, < 49.0.4"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-115892", "lastModified": "2026-10-23T22:16:58.777", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.7, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "HIGH", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "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", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-10-23T22:16:58.633", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937751a0bac5abd"}, {"source": "security-advisories@github.com", "url": "https://github.com/bytecodealliance/wasmtime/commit/48dacc76241f06088e79f3ce1b17642f2f7bf158"}, {"source": "security-advisories@github.com", "url": "https://github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17b9f67b31e618"}, {"source": "security-advisories@github.com", "url": "https://github.com/bytecodealliance/wasmtime/pull/14819"}, {"source": "security-advisories@github.com", "url": "https://github.com/bytecodealliance/wasmtime/pull/14820"}, {"source": "security-advisories@github.com", "url": "https://github.com/bytecodealliance/wasmtime/pull/14827"}, {"source": "security-advisories@github.com", "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v48.0.7"}, {"source": "security-advisories@github.com", "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v49.0.4"}, {"source": "security-advisories@github.com", "url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-9pvw-hwfg-92h5"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-248"}, {"lang": "en", "value": "CWE-843"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"created": "2026-10-23T22:30:14.518895+00:00", "updated": "2026-10-23T22:30:14.518901+00:00", "vendors": []}