CVE-2026-27204

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Embedders are recommended to upgrade and configure their embeddings as necessary to prevent possibly-malicious guests from triggering this issue."}], "source": {"advisory": "GHSA-852m-cvvp-9p4w", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-02-27T20:54:41.376330Z", "id": "CVE-2026-27204", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-02-27T20:54:48.839Z"}}]}}

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{"affected": [{"affectedData": [{"product": "wasmtime", "vendor": "bytecodealliance", "versions": [{"status": "affected", "version": "< 24.0.6"}, {"status": "affected", "version": ">= 25.0.0, < 36.0.6"}, {"status": "affected", "version": ">= 37.0.0, < 40.0.4"}, {"status": "affected", "version": ">= 41.0.0, < 41.0.4"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*", "matchCriteriaId": "FAB7C7D9-433F-4046-932B-44456BB034A3", "versionEndExcluding": "24.0.6", "vulnerable": true}, {"criteria": "cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*", "matchCriteriaId": "4AF1D021-3AC7-419E-AD0B-5C5738DC51E5", "versionEndExcluding": "36.0.6", "versionStartIncluding": "25.0.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*", "matchCriteriaId": "2DBCFCF3-5A70-4441-B73D-E1CE96B01BE7", "versionEndExcluding": "40.0.4", "versionStartIncluding": "37.0.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*", "matchCriteriaId": "9BF3C16E-C1D8-468A-9F60-9F6F45DA98E3", "versionEndExcluding": "41.0.4", "versionStartIncluding": "41.0.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Wasmtime is a runtime for WebAssembly. Prior to versions 24.0.6, 36.0.6, 4.0.04, 41.0.4, and 42.0.0, Wasmtime's implementation of WASI host interfaces are susceptible to guest-controlled resource exhaustion on the host. Wasmtime did not appropriately place limits on resource allocations requested by the guests. This serves as a Denial of Service vector. Wasmtime 24.0.6, 36.0.6, 40.0.4, 41.0.4, and 42.0.0 have all been released with the fix for this issue. These versions do not prevent this issue in their default configuration to avoid breaking preexisting behaviors. All versions of Wasmtime have appropriate knobs to prevent this behavior, and Wasmtime 42.0.0-and-later will have these knobs tuned by default to prevent this issue from happening. There are no known workarounds for this issue without upgrading. Embedders are recommended to upgrade and configure their embeddings as necessary to prevent possibly-malicious guests from triggering this issue."}, {"lang": "es", "value": "Wasmtime es un entorno de ejecuci\u00f3n para WebAssembly. Antes de las versiones 24.0.6, 36.0.6, 4.0.04, 41.0.4 y 42.0.0, la implementaci\u00f3n de Wasmtime de las interfaces de host WASI es susceptible al agotamiento de recursos controlado por el invitado en el host. Wasmtime no estableci\u00f3 adecuadamente l\u00edmites en las asignaciones de recursos solicitadas por los invitados. Esto sirve como un vector de denegaci\u00f3n de servicio. Se han lanzado las versiones Wasmtime 24.0.6, 36.0.6, 40.0.4, 41.0.4 y 42.0.0 con la correcci\u00f3n de este problema. Estas versiones no previenen este problema en su configuraci\u00f3n predeterminada para evitar romper comportamientos preexistentes. Todas las versiones de Wasmtime tienen controles apropiados para prevenir este comportamiento, y Wasmtime 42.0.0 y posteriores tendr\u00e1n estos controles ajustados por defecto para evitar que este problema ocurra. No hay soluciones alternativas conocidas para este problema sin actualizar. Se recomienda a los integradores actualizar y configurar sus incrustaciones seg\u00fan sea necesario para evitar que invitados posiblemente maliciosos exploten este problema."}], "id": "CVE-2026-27204", "lastModified": "2026-06-17T10:26:50.570", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "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": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.9, "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": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/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-2026-27204", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-02-27T20:54:41.376330Z", "version": "2.0.3"}}]}, "published": "2026-02-24T22:16:32.480", "references": [{"source": "security-advisories@github.com", "tags": ["Product"], "url": "https://docs.rs/wasmtime-wasi/latest/wasmtime_wasi/struct.WasiCtxBuilder.html#method.max_random_size"}, {"source": "security-advisories@github.com", "tags": ["Product"], "url": "https://docs.rs/wasmtime/latest/wasmtime/component/struct.ResourceTable.html#method.set_max_capacity"}, {"source": "security-advisories@github.com", "tags": ["Product"], "url": "https://docs.rs/wasmtime/latest/wasmtime/struct.Store.html#method.set_hostcall_fuel"}, {"source": "security-advisories@github.com", "tags": ["Product"], "url": "https://docs.wasmtime.dev/security-what-is-considered-a-security-vulnerability.html"}, {"source": "security-advisories@github.com", "tags": ["Issue Tracking"], "url": "https://github.com/bytecodealliance/wasmtime/issues/11552"}, {"source": "security-advisories@github.com", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://github.com/bytecodealliance/wasmtime/pull/12599"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-852m-cvvp-9p4w"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}, {"lang": "en", "value": "CWE-770"}, {"lang": "en", "value": "CWE-774"}, {"lang": "en", "value": "CWE-789"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-770"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "wasmtime: Wasmtime: Denial of Service via guest-controlled resource exhaustion in WASI host interfaces", "id": "2442480", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2442480"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["No description is available for this CVE."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-27204", "package_state": [{"cpe": "cpe:/a:redhat:connectivity_link:1", "fix_state": "Fix deferred", "package_name": "rhcl-1/wasm-shim-rhel9", "product_name": "Red Hat Connectivity Link 1"}], "public_date": "2026-02-24T21:23:47Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-27204\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-27204\nhttps://docs.rs/wasmtime-wasi/latest/wasmtime_wasi/struct.WasiCtxBuilder.html#method.max_random_size\nhttps://docs.rs/wasmtime/latest/wasmtime/component/struct.ResourceTable.html#method.set_max_capacity\nhttps://docs.rs/wasmtime/latest/wasmtime/struct.Store.html#method.set_hostcall_fuel\nhttps://docs.wasmtime.dev/security-what-is-considered-a-security-vulnerability.html\nhttps://github.com/bytecodealliance/wasmtime/issues/11552\nhttps://github.com/bytecodealliance/wasmtime/pull/12599\nhttps://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-852m-cvvp-9p4w"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,24.0.6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[25.0.0,36.0.6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[37.0.0,40.0.4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[41.0.0,41.0.4)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "wasmtime", "source": "cna", "vendor": "bytecodealliance"}, "product": "wasmtime", "vendor": "bytecodealliance"}], "analysis": {"en": {"generated_at": "2026-04-16T16:20:42.893604+00:00", "value": {"mitigation_remediation": ["Upgrade Wasmtime to version 24.0.6 or any later release that contains the patch.", "Enable the resource\u2011limit knobs provided in newer releases\u2014for example, configure WasiCtxBuilder.max_random_size, ResourceTable.set_max_capacity, or store.set_hostcall_fuel\u2014to enforce upper bounds on requested resources.", "Verify that the host configuration applies these limits before exposing untrusted WebAssembly modules."], "summary": {"action": "Upgrade", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "Bytecodealliance Wasmtime versions earlier than 24.0.6, 36.0.6, 40.0.4, 41.0.4, and 42.0.0 are vulnerable. The flaw is present in all builds before those releases; newer releases contain a fix but each embedder must enable the protective knobs to prevent exploitation. All versions of Wasmtime provide adjustable limits that must be configured to stop a malicious guest from exhausting resources.", "description_and_impact": "Wasmtime, a WebAssembly runtime, contains a flaw in its WASI host interface implementations that allows a malicious WebAssembly module to request an excessive amount of resources from the host. The runtime fails to enforce limits on allocations such as memory or other host resources, enabling resource exhaustion. Consequently an attacker can drain host CPU, memory, or other system resources, leading to denial of service. The weakness is reflected by improper resource handling and control, reflected by CWEs 400, 770, 774, and 789.", "risk_and_exploitability": "The CVSS score of 6.9 indicates a moderate severity level, and the EPSS score of less than 1% suggests a very low but non\u2011zero probability of exploitation. The vulnerability is not listed in the CISA KEV catalog. Attackers can exploit it from the guest side by submitting specially crafted WebAssembly modules that request excessive resources. Because the runtime does not impose limits by default, an untrusted guest can drive the host toward depletion of CPU or memory, interrupting services. The primary risk is denial of service to the host and any services that rely on Wasmtime."}}}}, "created": "2026-02-25T11:35:28.160580+00:00", "updated": "2026-04-16T16:30:15.928447+00:00", "vendors": ["bytecodealliance", "bytecodealliance$PRODUCT$wasmtime"]}