CVE-2026-32766 astral-tokio-tar insufficiently validates PAX extensions during extraction
Malformed PAX extensions are silently skipped, potentially enabling parser differential attacks if combined with a vulnerable secondary parser.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-32766?
CVE-2026-32766 is a low-severity vulnerability in astral-sh tokio-tar, published on 20 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
astral-tokio-tar is a tar archive reading/writing library for async Rust. In versions 0.5.6 and earlier, malformed PAX extensions were silently skipped when parsing tar archives. This silent skipping (rather than rejection) of invalid PAX extensions could be used as a building block for a parser differential, for example by silently skipping a malformed GNU “long link” extension so that a subsequent parser would misinterpret the extension. In practice, exploiting this behavior in astral-tokio-tar requires a secondary misbehaving tar parser, i.e. one that insufficiently validates malformed PAX extensions and interprets them rather than skipping or erroring on them. This vulnerability is considered low-severity as it requires a separate vulnerability against any unrelated tar parser. This issue has been fixed in version 0.6.0.
Weakness: CWE-436
Which versions are affected by CVE-2026-32766?
3 open source packages ship an affected version, including astral-tokio-tar. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
astral-tokio-tar crates.io | All versions | 0.6.0 |
astral-tokio-tar crates.io | All versions | 0.6.0 |
astral-tokio-tar crates.io | From 0.0.0-0 | 0.6.0 |
Products include Astral Astral-Tokio-Tar.
How do I fix CVE-2026-32766?
Upgrade astral-tokio-tar to 0.6.0 or later.
Is CVE-2026-32766 being exploited?
There is no known exploitation of CVE-2026-32766 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-32766, GHSA-6gx3-4362-rf54, MINI-5fm9-6g6x-ccmr, RUSTSEC-2026-0066, UBUNTU-CVE-2026-32766.