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CVE-2026-58494— Wasmtime: WASI hard links bypass wasmtime-wasi's FilePerms for destination

Quick assessment

Affected
bytecodealliance wasmtime
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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

CVSS 6.5 · Medium EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1044

Affected Version Matrix 4

VendorProduct Version RangeStatus
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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
权限预留不恰当
Source: CVE Program / CVE List V5
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

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III. Intelligence Information for CVE-2026-58494

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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
Same vendor: bytecodealliance
Same weakness: CWE-281

V. Comments for CVE-2026-58494

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