CVE-2026-58494

Wasmtime: WASI hard links bypass wasmtime-wasi's FilePerms for destination

Published: Jul 8, 2026Updated: Jul 10, 2026 Sources: CVE List NVDCWE-281

6.5MEDIUM

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:LAttack Vector

Local

AC:LAttack Complexity

Low

PR:LPrivileges Required

Low

UI:NUser Interaction

None

Scope

S:CScope

Changed

Impact

C:NConfidentiality

None

I:HIntegrity

High

A:NAvailability

None

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Weaknesses

CWE-281 CWE-863

Affected Products

bytecodealliance

oss-project

wasmtimeLibraryLibrary

OSS Libraries / generic-library

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

3 techniques

Initial Access

Privilege Escalation

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References

https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4ch3-9j33-3pmj

github.com

https://github.com/bytecodealliance/wasmtime/commit/5ddfd5f1ef28f2041fa07d237ad0336e167b0e0c

github.com

https://github.com/bytecodealliance/wasmtime/commit/7db94cdcf0c79cb3dfde884b534b653f2dd83367

github.com

and 6 more references View all →

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