🛡️ CVE-2026-58494 — wasmtime-wasi

🟡 CVSS 6.5 — Medium ✅ No Known Exploit CWE-281 NVD
6.5
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality none, integrity high, availability none.

Weakness class

CVE-2026-58494 is classified as CWE-281: Improper Preservation of Permissions. Permissions are not carried over correctly during an operation such as copy or restore, widening access.

Affected software

CVE-2026-58494 is recorded against 2 packages.

  • unknown
  • wasmtime-wasi

Timeline and source

Published on 8 July 2026 and last revised on 10 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

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Details

Severity MEDIUM
CVSS Score 6.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
CWE CWE-281
Public Exploit ✅ No
Source NVD
Published 2026-07-08
Updated 2026-08-12
Modified 2026-07-10
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown — —
wasmtime-wasi — —

Similar Threats

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