medium6.5
CVE-2026-58494
Wasmtime: WASI hard links bypass wasmtime-wasi's FilePerms for destination
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rust | wasmtime-wasi | < 24.0.11 | 24.0.11 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-4ch3-9j33-3pmj
- https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4ch3-9j33-3pmj
- https://nvd.nist.gov/vuln/detail/CVE-2026-58494
- https://github.com/bytecodealliance/wasmtime/pull/13725
- 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
- https://rustsec.org/advisories/RUSTSEC-2026-0188.html