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{"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"}

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