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{"bugzilla": {"description": "wasmtime: Wasmtime 39.0.0 before 48.0.4 and 49.0.0 before 49.0.2 Stack Buffer Overflow", "id": "2559233", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2559233"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["Wasmtime 39.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a stack buffer overflow vulnerability that allows malicious guests to write ~16KB to the native stack via unvalidated async callback result types. Attackers can supply components with mistyped component-model-async callback functions to overwrite return addresses, crashing the host or escaping the sandbox.", "A flaw was found in Wasmtime. A malicious guest can trigger a stack-based buffer overflow by supplying asynchronous callback functions with mismatched result types. This vulnerability allows the guest to overwrite host stack memory, enabling them to escape the WebAssembly (Wasm) sandbox, potentially execute arbitrary code, or cause a denial of service (DoS) by crashing the host system."], "mitigation": {"lang": "en:us", "value": "Only execute verified WebAssembly components and isolate the runtime process using system sandboxing.\nOperational controls:\n1. Restrict execution to trusted, vetted WebAssembly components. Avoid loading or executing unverified third-party components that define asynchronous callback functions.\n2. If untrusted modules must be evaluated, run the host runtime process inside an unprivileged container (such as Podman) or apply systemd service sandboxing options (such as `ProtectSystem=strict`, `NoNewPrivileges=yes`, and seccomp filters) to restrict host access in the event of a sandbox escape.\nCaveats:\nLimiting guest code to trusted sources restricts multi-tenant or dynamic plugin capabilities. Operating within an isolated container or restricted systemd environment may require adjustments to host filesystem permissions and mounts, and does not prevent a denial of service crash of the isolated runtime process."}, "name": "CVE-2026-115384", "package_state": [{"cpe": "cpe:/a:redhat:connectivity_link:1", "fix_state": "Not affected", "package_name": "rhcl-1/wasm-shim-rhel9", "product_name": "Red Hat Connectivity Link 1"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "tree-sitter", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "virt-firmware-rs", "product_name": "Red Hat Enterprise Linux 10"}], "public_date": "2026-10-22T19:13:51Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-115384\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-115384\nhttps://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-32h6-97mm-8q3c\nhttps://www.vulncheck.com/advisories/wasmtime-39.0.0-before-48.0.4-and-49.0.0-before-49.0.2-stack-buffer-overflow"], "statement": "This vulnerability is rated as Important severity because an attacker capable of executing guest code within Wasmtime can escape the containment boundary and achieve host-level execution or crash the host process. While Red Hat environments rarely expose WebAssembly runtimes directly to unauthenticated network users, workloads that process untrusted guest modules are directly at risk. Exploitation requires the attacker to have existing privileges or submission capabilities to run custom components utilizing asynchronous callback interfaces.", "threat_severity": "Important"}

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