PT-2026-56584 · Bytecode Alliance · Wasmtime

Published 2026-07-08 · Updated 2026-07-08 · CVE-2026-58494

NVD

CVSS v3.1

6.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N

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.

Fix

Improper Preservation of Permissions

Incorrect Authorization

Weakness Enumeration

CWE-281

CWE-863

Related Identifiers

CVE-2026-58494

Affected Products

Wasmtime

References · 10

• https://nvd.nist.gov/vuln/detail/CVE-2026-58494 · Security Note
• https://github.com/bytecodealliance/wasmtime/commit/8a250aac0962ca1364b5f16525720e9d0b39edcd · Note
• https://github.com/bytecodealliance/wasmtime/commit/5ddfd5f1ef28f2041fa07d237ad0336e167b0e0c · Note
• https://github.com/bytecodealliance/wasmtime/releases/tag/v24.0.11 · Note
• https://github.com/bytecodealliance/wasmtime/releases/tag/v45.0.3 · Note
• https://github.com/bytecodealliance/wasmtime/releases/tag/v46.0.1 · Note
• https://github.com/bytecodealliance/wasmtime/commit/7db94cdcf0c79cb3dfde884b534b653f2dd83367 · Note
• https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.12 · Note
• https://github.com/bytecodealliance/wasmtime/commit/d3ceb56ec35f39e02496eeb4e2d9c7f4fb964d9e · Note
• https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4ch3-9j33-3pmj · Note