CVE-2026-58494
Medium
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.
SeverityMedium
CVSS6.5
Exploit probability—
ProductBytecodealliance Wasmtime
PublishedJul 8, 2026
First seenJul 8, 2026
Weakness typeCWE-281CWE-281CWE-863Incorrect authorization
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| bytecodealliance wasmtime | < 24.0.11, >= 25.0.0, < 36.0.12, >= 37.0.0, < 45.0.3, >= 46.0.0, < 46.0.1 | — |
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