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

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Summary

CVECVE-2026-58494
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-08 21:16:54 UTC
Updated2026-07-08 21:16:54 UTC
DescriptionWasmtime 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N

Problem Types: CWE-281 | CWE-863 | CWE-281 CWE-281: Improper Preservation of Permissions | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Bytecodealliance Wasmtime affected < 24.0.11 Not specified
CNA Bytecodealliance Wasmtime affected >= 25.0.0, < 36.0.12 Not specified
CNA Bytecodealliance Wasmtime affected >= 37.0.0, < 45.0.3 Not specified
CNA Bytecodealliance Wasmtime affected >= 46.0.0, < 46.0.1 Not specified

References

ReferenceSourceLinkTags
github.com/bytecodealliance/wasmtime/commit/8a250aac0962ca1364b5f1652572... [email protected] github.com
github.com/bytecodealliance/wasmtime/commit/5ddfd5f1ef28f2041fa07d237ad0... [email protected] github.com
github.com/bytecodealliance/wasmtime/releases/tag/v36.0.12 [email protected] github.com
github.com/bytecodealliance/wasmtime/commit/d3ceb56ec35f39e02496eeb4e2d9... [email protected] github.com
github.com/bytecodealliance/wasmtime/releases/tag/v24.0.11 [email protected] github.com
github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4ch3-9j33-... [email protected] github.com
github.com/bytecodealliance/wasmtime/releases/tag/v46.0.1 [email protected] github.com
github.com/bytecodealliance/wasmtime/commit/7db94cdcf0c79cb3dfde884b534b... [email protected] github.com
github.com/bytecodealliance/wasmtime/releases/tag/v45.0.3 [email protected] github.com
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