Is CVE-2026-58494 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-58494?

CVE-2026-58494 has a CVSS v3 severity of MEDIUM (6.5).

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CVE-2026-58494

Description

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.