CVE-2026-58494— Wasmtime: WASI hard links bypass wasmtime-wasi's FilePerms for destination
Possible ATT&CK Techniques 1AI
T1044Affected Version Matrix 4
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| bytecodealliance | wasmtime | < 24.0.11 | affected |
>= 25.0.0, < 36.0.12 | affected | ||
>= 37.0.0, < 45.0.3 | affected | ||
>= 46.0.0, < 46.0.1 | affected |
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I. Basic Information for CVE-2026-58494
Vulnerability Information
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Vulnerability Title
Wasmtime: WASI hard links bypass wasmtime-wasi's FilePerms for destination
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
权限预留不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
bytecodealliance wasmtime 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
bytecodealliance Wasmtime是bytecodealliance组织开源的一个WebAssembly与WASI运行时。 bytecodealliance wasmtime存在安全漏洞，该漏洞源于wasmtime-wasi在创建硬链接和重命名时检查目录权限但未匹配源和目标预打开的FilePerms，允许具有只读源文件能力的WASI guest通过wasip1、wasip2或wasip3 filesystem接口覆盖以FilePerms::READ暴露的主机文件。以下版本受到影响：24.0
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| bytecodealliance | wasmtime | < 24.0.11 | - |
II. Public POCs for CVE-2026-58494
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-58494 (4)
Vendor Advisories for CVE-2026-58494 (1)
Vendor Pages for CVE-2026-58494 (4)
IV. Related Vulnerabilities
Same product: wasmtime
- CVE-2026-54786
Wasmtime: Leak in WASIp1 `fd_renumber` implementation - CVE-2026-47261
Wasmtime: WASI path_open(TRUNCATE) bypasses `FilePerms::WRIT - CVE-2026-44216
Wasmtime: Panic when allocating a table exceeding the size o - CVE-2026-35195
Wasmtime has an out-of-bounds write or crash when transcodin - CVE-2026-35186
Wasmtime has an improperly masked return value from `table.g
Same vendor: bytecodealliance
- CVE-2026-54786
Wasmtime: Leak in WASIp1 `fd_renumber` implementation - CVE-2026-47261
Wasmtime: WASI path_open(TRUNCATE) bypasses `FilePerms::WRIT - CVE-2026-44216
Wasmtime: Panic when allocating a table exceeding the size o - CVE-2026-35195
Wasmtime has an out-of-bounds write or crash when transcodin - CVE-2026-35186
Wasmtime has an improperly masked return value from `table.g
Same weakness: CWE-281
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V. Comments for CVE-2026-58494
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