---
id: CVE-2024-51756
aliases:
  - RUSTSEC-2024-0445
  - GHSA-hxf5-99xg-86hw
title: cap-primitives doesn't fully sandbox all the Windows device filenames
summary: cap-primitives doesn't fully sandbox all the Windows device filenames
severity: none
vendor: cap-primitives
product: cap-primitives
ecosystem: rust
affected:
  - 'cap-primitives >= 0.0.0-0, < 3.4.1'
patched:
  - cap-primitives 3.4.1
published: '2024-11-05'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T18:00:13.004711734Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/RUSTSEC-2024-0445'
references:
  - url: 'https://crates.io/crates/cap-primitives'
  - url: 'https://rustsec.org/advisories/RUSTSEC-2024-0445.html'
  - url: 'https://github.com/bytecodealliance/cap-std/pull/371'
  - url: 'https://github.com/bytecodealliance/cap-std/pull/371'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2024-51756'
tags:
  - osv
  - rust
epss: 0.00583
epssPercentile: 0.47689
ingestedAt: '2026-10-13T11:45:30.175Z'
---

## Overview

## Impact

cap-primitives's filesystem sandbox implementation on Windows blocks
access to special device filenames such as "COM1", "COM2",
"LPT0", "LPT1", and so on, however it did not block access
to the special device filenames which use superscript digits,
such as "COM¹", "COM²", "LPT⁰", "LPT¹", and so on. Untrusted
filesystem paths could bypass the sandbox and access devices
through those special device filenames with superscript
digits, and through them provide access peripheral devices
connected to the computer, or network resources mapped to
those devices. This can include modems, printers, network
printers, and any other device connected to a serial or
parallel port, including emulated USB serial ports.

## Patches

The bug is fixed in #371, which is published in
cap-primitives 3.4.1, cap-std 3.4.1, and cap-async-std 3.4.1.

## Workarounds

There are no known workarounds for this issue.
Affected Windows users are recommended to upgrade.

## Affected packages

- `cap-primitives >= 0.0.0-0, < 3.4.1`

## Remediation

Upgrade to a patched release:

- `cap-primitives 3.4.1`