CVE-2026-58494

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{"affected": [{"affectedData": [{"product": "wasmtime", "vendor": "bytecodealliance", "versions": [{"status": "affected", "version": "< 24.0.11"}, {"status": "affected", "version": ">= 25.0.0, < 36.0.12"}, {"status": "affected", "version": ">= 37.0.0, < 45.0.3"}, {"status": "affected", "version": ">= 46.0.0, < 46.0.1"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Wasmtime is a runtime for WebAssembly. Prior to 24.0.11, 36.0.12, 45.0.3, and 46.0.1, wasmtime-wasi hard-link creation and renaming check directory permissions but not matching FilePerms on source and destination preopens, allowing a WASI guest with a read-only source file capability to overwrite host files exposed as FilePerms::READ through wasip1, wasip2, or wasip3 filesystem interfaces. This issue is fixed in versions 24.0.11, 36.0.12, 45.0.3, and 46.0.1."}, {"lang": "es", "value": "Wasmtime es un tiempo de ejecuci\u00f3n para WebAssembly. Antes de las versiones 24.0.11, 36.0.12, 45.0.3 y 46.0.1, la creaci\u00f3n y el renombramiento de enlaces duros de wasmtime-wasi comprueban los permisos de directorio, pero no los FilePerms coincidentes en las preaperturas de origen y destino, lo que permite a un invitado WASI con una capacidad de archivo de origen de solo lectura sobrescribir archivos del host expuestos como FilePerms::READ a trav\u00e9s de las interfaces del sistema de archivos wasip1, wasip2 o wasip3. Este problema est\u00e1 solucionado en las versiones 24.0.11, 36.0.12, 45.0.3 y 46.0.1."}], "id": "CVE-2026-58494", "lastModified": "2026-10-25T17:10:00.197", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 4.0, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-58494", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-09T13:28:46.718754Z", "version": "2.0.3"}}]}, "published": "2026-07-08T21:16:54.000", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/bytecodealliance/wasmtime/commit/5ddfd5f1ef28f2041fa07d237ad0336e167b0e0c"}, {"source": "security-advisories@github.com", "url": "https://github.com/bytecodealliance/wasmtime/commit/7db94cdcf0c79cb3dfde884b534b653f2dd83367"}, {"source": "security-advisories@github.com", "url": "https://github.com/bytecodealliance/wasmtime/commit/8a250aac0962ca1364b5f16525720e9d0b39edcd"}, {"source": "security-advisories@github.com", "url": "https://github.com/bytecodealliance/wasmtime/commit/d3ceb56ec35f39e02496eeb4e2d9c7f4fb964d9e"}, {"source": "security-advisories@github.com", "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v24.0.11"}, {"source": "security-advisories@github.com", "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.12"}, {"source": "security-advisories@github.com", "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v45.0.3"}, {"source": "security-advisories@github.com", "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v46.0.1"}, {"source": "security-advisories@github.com", "url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4ch3-9j33-3pmj"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-281"}, {"lang": "en", "value": "CWE-863"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "wasmtime: Wasmtime: Overwrite host files via insufficient permission checks in wasmtime-wasi", "id": "2498250", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2498250"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N", "status": "draft"}, "cwe": "CWE-280", "details": ["A flaw was found in Wasmtime, a runtime for WebAssembly. A WebAssembly System Interface (WASI) guest with a read-only source file capability can exploit this vulnerability. During hard-link creation and renaming operations, the system checks directory permissions but fails to match file permissions on source and destination preopens. This allows the guest to overwrite host files exposed with read permissions through WASI filesystem interfaces."], "name": "CVE-2026-58494", "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"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "virt-firmware-rs", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "impact": "moderate", "package_name": "rust", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-08T20:22:16Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-58494\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-58494\nhttps://github.com/bytecodealliance/wasmtime/commit/5ddfd5f1ef28f2041fa07d237ad0336e167b0e0c\nhttps://github.com/bytecodealliance/wasmtime/commit/7db94cdcf0c79cb3dfde884b534b653f2dd83367\nhttps://github.com/bytecodealliance/wasmtime/commit/8a250aac0962ca1364b5f16525720e9d0b39edcd\nhttps://github.com/bytecodealliance/wasmtime/commit/d3ceb56ec35f39e02496eeb4e2d9c7f4fb964d9e\nhttps://github.com/bytecodealliance/wasmtime/releases/tag/v24.0.11\nhttps://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.12\nhttps://github.com/bytecodealliance/wasmtime/releases/tag/v45.0.3\nhttps://github.com/bytecodealliance/wasmtime/releases/tag/v46.0.1\nhttps://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4ch3-9j33-3pmj"], "statement": "This Moderate-impact flaw in Wasmtime allows a malicious WebAssembly System Interface (WASI) guest to overwrite host files. By exploiting insufficient permission checks during hard-link and rename operations, a guest with read-only file capabilities can modify host files that are exposed with read permissions through WASI filesystem interfaces. This could lead to data integrity issues on the host system.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,24.0.11)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[25.0.0,36.0.12)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[37.0.0,45.0.3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[46.0.0,46.0.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "wasmtime", "source": "cna", "vendor": "bytecodealliance"}, "product": "wasmtime", "vendor": "bytecodealliance"}], "created": "2026-07-08T21:30:08.286524+00:00", "updated": "2026-08-01T15:45:04.320336+00:00", "vendors": ["bytecodealliance", "bytecodealliance$PRODUCT$wasmtime"]}