CVE-2026-58494 PUBLISHED

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.

• https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4ch3-9j33-3pmj
• https://github.com/bytecodealliance/wasmtime/commit/5ddfd5f1ef28f2041fa07d237ad0336e167b0e0c
• https://github.com/bytecodealliance/wasmtime/commit/7db94cdcf0c79cb3dfde884b534b653f2dd83367
• https://github.com/bytecodealliance/wasmtime/commit/8a250aac0962ca1364b5f16525720e9d0b39edcd
• https://github.com/bytecodealliance/wasmtime/commit/d3ceb56ec35f39e02496eeb4e2d9c7f4fb964d9e
• https://github.com/bytecodealliance/wasmtime/releases/tag/v24.0.11
• https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.12
• https://github.com/bytecodealliance/wasmtime/releases/tag/v45.0.3
• https://github.com/bytecodealliance/wasmtime/releases/tag/v46.0.1

• CWE-281: Improper Preservation of Permissions CWE
• CWE-863: Incorrect Authorization CWE