CVE-2026-24116

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Starting in version 29.0.0 and prior to version 36.0.5, 40.0.3, and 41.0.1, on x86-64 platforms with AVX, Wasmtime's compilation of the `f64.copysign` WebAssembly instruction with Cranelift may load 8 more bytes than is necessary. When signals-based-traps are disabled this can result in a uncaught segfault due to loading from unmapped guard pages. With guard pages disabled it's possible for out-of-sandbox data to be loaded, but unless there is another bug in Cranelift this data is not visible to WebAssembly guests. Wasmtime 36.0.5, 40.0.3, and 41.0.1 have been released to fix this issue. Users are recommended to upgrade to the patched versions of Wasmtime. Other affected versions are not patched and users should updated to supported major version instead. This bug can be worked around by enabling signals-based-traps. While disabling guard pages can be a quick fix in some situations, it's not recommended to disabled guard pages as it is a key defense-in-depth measure of Wasmtime."}, {"lang": "es", "value": "Wasmtime es un entorno de ejecuci\u00f3n para WebAssembly. A partir de la versi\u00f3n 29.0.0 y antes de las versiones 36.0.5, 40.0.3 y 41.0.1, en plataformas x86-64 con AVX, la compilaci\u00f3n de Wasmtime de la instrucci\u00f3n WebAssembly f64.copysign con Cranelift puede cargar 8 bytes m\u00e1s de los necesarios. Cuando las trampas basadas en se\u00f1ales est\u00e1n deshabilitadas, esto puede resultar en un segfault no detectado debido a la carga desde p\u00e1ginas de guardia no mapeadas. Con las p\u00e1ginas de guardia deshabilitadas, es posible que se carguen datos fuera de la sandbox, pero a menos que haya otro error en Cranelift, estos datos no son visibles para los invitados de WebAssembly. Wasmtime 36.0.5, 40.0.3 y 41.0.1 han sido lanzadas para solucionar este problema. Se recomienda a los usuarios actualizar a las versiones parcheadas de Wasmtime. Otras versiones afectadas no est\u00e1n parcheadas y los usuarios deber\u00edan actualizar a una versi\u00f3n principal compatible en su lugar. Este error se puede eludir habilitando las trampas basadas en se\u00f1ales. Si bien deshabilitar las p\u00e1ginas de guardia puede ser una soluci\u00f3n r\u00e1pida en algunas situaciones, no se recomienda deshabilitar las p\u00e1ginas de guardia, ya que es una medida clave de defensa en profundidad de Wasmtime."}], "id": "CVE-2026-24116", "lastModified": "2026-06-17T10:22:39.380", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 4.1, "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": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "ACTIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-24116", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-01-27T19:22:29.285417Z", "version": "2.0.3"}}]}, "published": "2026-01-27T19:16:16.180", "references": [{"source": "security-advisories@github.com", "tags": ["Product"], "url": "https://docs.rs/wasmtime/latest/wasmtime/struct.Config.html#method.memory_guard_size"}, {"source": "security-advisories@github.com", "tags": ["Product"], "url": "https://docs.rs/wasmtime/latest/wasmtime/struct.Config.html#method.signals_based_traps"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://docs.wasmtime.dev/stability-release.html"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/bytecodealliance/wasmtime/commit/728fa07184f8da2a046f48ef9b61f869dce133a6"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/bytecodealliance/wasmtime/commit/799585fc362fcb991de147dd1a9f2ba0861ed440"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/bytecodealliance/wasmtime/commit/ac92d9bb729ad3a6d93f0724c4c33a0c4a9c0227"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Vendor Advisory"], "url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-vc8c-j3xm-xj73"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://rustsec.org/advisories/RUSTSEC-2026-0006.html"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"analysis": {"en": {"generated_at": "2026-04-18T01:58:32.451764+00:00", "value": {"mitigation_remediation": ["Upgrade Wasmtime to at least version 36.0.5 for the current major line, or to 40.0.3 or 41.0.1; any newer release includes the fix.", "If upgrading cannot be performed immediately, enable signals\u2011based\u2011traps in the Wasmtime configuration to avoid the segfault.", "Avoid disabling guard pages, as they are a critical defense\u2011in\u2011depth measure preventing out\u2011of\u2011sandbox reads."], "summary": {"action": "Upgrade Now", "impact": "Denial of Service (Crash)"}, "threat_synthesis": {"affected_systems": "The issue applies to the bytecodealliance Wasmtime runtime on x86\u201164 platforms with AVX support. Vulnerable versions span from 29.0.0 up to, but not including, the patched releases 36.0.5, 40.0.3, and 41.0.1. Users should update to one of those releases or to a later major version that contains the fix.", "description_and_impact": "This flaw occurs in the Wasmtime runtime when compiling the WebAssembly instruction f64.copysign on x86\u201164 machines that support AVX. The generated code may load eight bytes beyond the intended operand, which can trigger an uncaught segfault if signals\u2011based\u2011traps are disabled, or may cause data from outside the sandbox to be read when guard pages are disabled. The crash represents a denial\u2011of\u2011service attack; the out\u2011of\u2011bounds read does not leak guest memory because the extra load is not visible to WebAssembly modules, making it a classic out\u2011of\u2011bounds read weakness (CWE\u2011125).", "risk_and_exploitability": "With a CVSS score of 4.1 the severity is low, and an EPSS score of less than 1\u202f% indicates a very low probability of exploitation. The defect causes a process crash rather than allowing remote code execution or memory disclosure; thus the overall risk is mild. No CISA KEV listing is present. The attack vector is local\u2014any component that feeds WebAssembly code into Wasmtime can trigger the failure if signals\u2011based\u2011traps are disabled or guard pages are turned off."}}}}, "created": "2026-01-28T12:21:56.275921+00:00", "updated": "2026-04-18T02:00:10.473302+00:00", "vendors": ["bytecodealliance", "bytecodealliance$PRODUCT$wasmtime"]}